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Best mattress online 2021: Plus, the best mattress in a box to buy now

Best mattress online 2021: Plus, the best mattress in a box to buy now
(Image credit: Casper)

In our experience, the best mattress online is one designed to better support your dominant sleep position (side sleeper, back sleeper, and so on), and to cater to your other posture and health needs. For example, a good mattress for back pain will balance comfort with pressure relief across key areas of your body, and ensure better spinal alignment during sleep so that you won’t wake up feeling stiff and bent out of shape. The thing to note straight away is that there isn’t ‘one mattress to rule them all’. Yes some online mattresses claim to cater to a wider range of sleepers, but there are fewer of those than you’d think. 

So, when picking the best mattress online for you, and after setting a budget, we’d recommend thinking about the position you normally fall asleep in. This is your dominant sleep position. Once you know what this is, you can start narrowing down your search of top-rated mattresses to find the ones designed for your sleep position. It’s the same advice we give when recommending the best pillows. Next, think about the types of things that normally disturb your sleep. Is it your partner tossing and turning? Then a good mattress for you is one with motion isolation. Tend to sleep hot? Opt for the best cooling mattress instead.

In our guide to the best mattress online, we’ve looked at the world’s most trusted mattress brands, most of which sell affordable mattresses too. Some start from just a few hundred dollars, though they quickly escalate in price if you want a top-performing hybrid mattress or non-toxic organic mattress. Our guides to the best Purple mattress deals, the best Casper mattress deals, and the best Saatva mattress discounts can help you save money here. The majority of mattress brands offer a trial period too, so you’ll get to try out your new bed before fully committing.

For other ways to enjoy better sleep, take a look at our guide to the best sound machines for soothing white noise, and the best sunrise alarm clocks for a natural wake-up call.

The 11 best mattresses online

1. Purple Hybrid: Best mattress online overall

Best mattress online: Purple Hybrid Mattress

(Image credit: Purple)

Purple Hybrid

Also one of the best hybrid mattresses money can buy right now


Sizes: Twin to Cal King | Filling: Hyper-elastic polymer, polyfoam and coils | Comfort: Medium - Firm | Trial period: 100 days | Full refund: Yes | Weight: 77-148Ibs (in box)

Reasons to Buy

Relieves pressure on back and hips
Ensures good spinal alignment
Breathable during sleep

Reasons to Avoid

You have to trial it for at least 21 days

Purple has mastered the art of providing a cool night’s sleep thanks to their patented Purple Grid Technology, a layer of hyper-elastic polymer molded into a grid shape that boosts airflow and comfort. It contours around the body just like memory foam, but is more responsive. You also won’t overheat thanks to the temperature-neutral gel and 1,800+ air channels that let the air flow freely. 

All of this is enhanced by Purple’s Responsive Support Coils offering no pressure support that instantly adapts to your body and supports your curves, leaving you feeling as though you’re floating each time you lie down. 

We also love that the Purple Hybrid has excellent motion isolation. So if you’re sleeping with a partner who likes to move around a lot, you won’t feel them tossing and turning. This stunning Purple mattress is suited to most types of sleeper, but side sleepers will especially love this mattress as it offers the right amount of support for hips, shoulders and helps to maintain perfect spinal alignment. 

Best mattress online: Saatva Zenhaven Mattress

(Image credit: Saatva)

2. Saatva Zenhaven: Best mattress for back pain

Saatva Zenhaven Mattress

Also the best mattress in a box for dual levels of firmness


Sizes: Twin to Cal King | Filling: Latex | Comfort: Luxury Plush or Gentle Firm | Trial period: 120 nights | Full refund: Yes | Weight in box: 147-184lbs

Reasons to Buy

Superb back support
Chiropractor approved
Allergy friendly

Reasons to Avoid

You need a firmer mattress

Can’t decide if you want a firm or plush mattress? Well, with the sumptuous Saatva Zenhaven you no longer have to pick a side because it comes with both! This clever mattress is made from 100% (natural) Talalay latex and is flippable, with two different firmness levels: one side offers a firm feel, the other has a luxury plush feel. 

Even Goldilocks would be happy with this versatile mattress, making it the best mattress online for the super-picky.

Saatva’s choice of Talalay latex is also another huge plus for the Zenhaven, as Talalay latex is a high-quality natural foam made from the sap of rubber trees. It comes with a whole host of benefits including being naturally antimicrobial. This makes the Zenhaven resistant to mold and bacteria, as well as being dust mite resistant. 

The Saatva Zenhaven is also extremely comfortable and offers ‘five-zone’ layers for next-level comfort and support. It’s very responsive, so you won’t feel as though you’re sinking into this mattress, regardless of the firmness level you choose. The latex foam material also makes for a cooler sleep, as it’s naturally cool and promotes better airflow. 

For the earth-minded among you, you’ll be pleased to hear that the Zenhaven is eco-friendly and contains no nasty toxins. Best of all, it comes with a ginormous 20-year warranty, so you know this mattress is built to last.  

3. Tempur-Cloud: Best mattress for NASA-level comfort

Best mattress online: Tempur-Pedic Cloud Mattress in a box

(Image credit: Tempur-Pedic)

Tempur-Pedic Cloud Mattress

Space fans, you'll love this mattress in a box


Sizes: Twin, Twin Long, Full, Queen, King, Cal King | Filling: Tempur, plus a stretch fabric cover | Comfort: Medium | Height: 10” | Weight: 39.3lbs - 84.9 lbs | Trial period: 90 nights (must try for at least 30 nights) | Warranty: 10-year full replacement limited warranty

Reasons to Buy

NASA-developed materials
Superb motion isolation
The cheapest Tempur-Pedic mattress

Reasons to Avoid

You may find it ‘hugs’ you too much
Return shipping fee

Tempur-Pedic is one of the world’s most popular mattress brands, and until recently you were only able to buy Tempur mattresses in store. However, the Tempur-Pedic Cloud Mattress changed all that, marking the company’s first step into ‘compressed mattresses’, also known as mattresses in a box. 

The medium-firm Cloud Mattress is made from the same Tempur material the brand has become famous for, and strives to offer all that Tempur-Pedic sleep prowess at a more reasonable price. Even though it’s now the cheapest mattress in the five-strong Tempur-Pedic range, it’s almost three times the price of other affordable mattresses in this guide, starting from $1,699 for the Twin size and rising to $2,399 for the Cal King.

The all-foam Tempur-Pedic Cloud Mattress is a three-layer affair, two of which are stuffed with high-density Tempur material. Tempur is similar in performance to memory foam, and is made with the same pressure relieving material originally developed by NASA to make astronauts feel comfier during take-off. The top two layers of the Cloud form the comfort system, with the second layer of foam made slightly firmer to prevent sagging. The third layer is the support core, made of dense polyfoam to act as a sturdy base. The entire mattress is then covered in soft, moisture-wicking fabric. 

A major attraction with the Tempur-Pedic Cloud Mattress is something called ‘deep contouring’. In a nutshell, this means the Cloud will mould itself to your unique body weight and height, holding you in all the right places so that you feel almost weightless during sleep. This is naturally beneficial to anyone who experiences stiffness or pain when lying down, while the medium-firm feel is the sweet spot for most people.

The Tempur-Pedic Cloud Mattress is well-suited to side sleepers, and to people who want maximum pressure relief on their neck, back, hips and waist (all high pressure points, depending on your dominant sleep style). As Tempur-Pedic has designed this mattress in a box with good edge support, plus high levels of motion isolation, it’s also suited to couples. Edge support means you can spread out and use every inch of the mattress without worrying about rolling over the edge, while motion isolation works to help you sleep through even if your partner is moving around a lot.

Best mattress online: Casper Nova Hybrid Mattress

(Image credit: Casper)

4. Casper Nova: Best mattress online for pressure relief

Casper Nova Hybrid Mattress

A superb hybrid mattress online for all sleep styles


Sizes: Twin - Cal King | Filling: Polyurethane foam and springs | Comfort: Medium/Soft | Trial period: 100 nights | Full refund: Yes | Weight in box: 92lbs

Reasons to Buy

Good for multiple sleep styles
Contours to your body
Eases pressure on your back

Reasons to Avoid

Won't be firm enough for some

If you want a plush, comfortable mattress yet need extra support on your pressure points, give serious consideration to the Casper Nova Hybrid. This soft-touch mattress uses Zoned Support Pro layers to fully support your back and hips, with added pressure relief around your shoulders. 

The Nova Hybrid is also a great mattress for side, back and combination sleepers, making it a very versatile choice, and it does a great job of balancing your need for soothing comfort with a brilliant level of support. 

Do you sleep hot? Us too, and that’s why we love the layer of Airscape foam laced throughout this mattress. You see, it has small perforations that boost cool airflow and actively push away (disperse) hot air and body heat so that you sleep cooler and comfier for longer. After all, there’s nothing worse than trying to figure out how to sleep when it’s hot at night.

The Casper Nova Hybrid is very soft, so to begin with you may feel very much like you're sinking into it, but a fourth layer of six-inch pocketed coils will catch and support you beautifully as you rest up. That responsive support also means that you’ll be able to move around easily, making it one of the best mattresses if you’re a combination sleeper who flips and flops between sleep styles. 

5. Helix Mattress: A mattress you can create to your liking

Best mattress online: Helix Mattress

(Image credit: Helix)

Helix Mattress

The best mattress online if you want something more custom


Sizes: Twin to Cal King | Filling: Memory foam and pocket springs | Comfort: Medium | Trial period: 100 days | Full refund: Yes | Weight in box: 89.5Ibs

Reasons to Buy

You can customize each side
Supportive where you need it most
Good range of prices

Reasons to Avoid

Firmer than anticipated

The Helix Mattress is our choice for the best mattress online if you want something customized to your exact sleep tastes. That’s because you can fully customize the mattress thanks to an innovative short quiz that you take before you make your purchase. Questions they ask include your firmness preference, weight, height and ideal sleeping position. 

In total there are six variants of the Helix Mattress, offering different levels of firmness to suit your ideal sleeping preference. 

You can also purchase your chosen mattress in either standard or Luxe version, with the Luxe version benefitting from zoned lumbar support, a premium quilted pillow top and an ultra-cool cover to help you stay cool and comfortable when sleeping. There's also the Helix PLUS, designed for plus size, big and tall people, and offers maximum support alongside a medium feel and body contouring. 

The Helix comes in twin, twin XL, full, queen, king, and California king sizes, with a standard 10-inch depth. The prices range from $600 through to $1,249, which is pretty impressive considering you’re getting a customized mattress that suits your individual needs far more precisely. 

The Helix Mattress is extremely good for motion isolation, too. Why? It's because of the combination of pocketed micro coils and foam. The Helix also benefits from a 100-night trial with full money-back guarantee if you’re not completely satisfied. If you’re new to the feel of memory foam, give yourself a little time to get used to the feel, but do persevere because this is one of the most comfortable mattresses you'll ever sleep on. 

6. Purple Original: Best mattress online for couples

Best mattress: the Purple Mattress is our top mattress for joint and back comfort

(Image credit: Purple)

Purple Original Mattress

If you're experiencing back or joint pain, rest easy on this beauty


Sizes: Twin to Cal King | Filling: Hyper-elastic polymer | Comfort: High | Trial period: 100 days | Full refund: Yes | Weight in box: 115Ibs

Reasons to Buy

Excellent for pressure relief and joint pain
Ideal for hot sleepers

Reasons to Avoid

Heavy and hard to move around
The mattress can feel bouncy

The Purple Original mattress was a very strong contender for our top pick overall, but we think its true title is that it’s the best mattress for back and joint pain. This mattress has a unique hyper-elastic polymer mattress top which they call Purple Grid technology. This grid adapts to your body to offer the comfort and support that you need and to help ease any aches and pains you may be experiencing. 

The Purple Grid technology also has over 2800 open-air channels which can help neutralize body heat so you don’t get too hot overnight which can often happen with memory foam mattresses. 

The Purple Original mattress comes in seven sizes: twin, twin XL, full, queen, king, cal king and split king. The RRP ranges from $649 for the twin to $1498 for the split king. We think that this is one of the most budget-friendly mattress-in-a-box products on the market considering the material and technology involved. 

Made up of three layers each designed to relieve pressure points and maintain support on body contours. The mattress composition starts with two-inches of purple grid technology which is then bolstered by two layers of polyurethane foam beneath. It has good edge-to-edge support thanks to the edges being reinforced with denser foam. Whilst the mattress does have a little more bounce, the movement is absorbed by the thick foam core.

7. Saatva Classic: Best mattress online for allergies

Best mattress: the Saatva Mattress is a luxury mattress and therefore has a higher price

(Image credit: Saatva)

Saatva Classic Mattress

Also one of the most comfortable mattresses on test


Sizes: Twin to Cal King | Filling: Pocket springs with pillow top | Comfort: High | Trial period: 120 days | Full refund: No ($100 delivery un-refundable) | Weight in box: 110Ibs

Reasons to Buy

Multiple firmness options
Choice of two depths

Reasons to Avoid

$99 fee to return mattress if not satisfied

We're partial to a little bit of luxury, and thanks to Saatva we found it. In terms of sheer comfort, the Saatva mattress was one of the best mattresses we slept on during testing, but that luxury is reflected in the price tag. However, we do believe in paying for quality, so we think this one is worth the extra cost. 

Unlike other online mattress companies, the Saatva mattress doesn’t come in a box, instead, they offer white glove delivery installing your new mattress in the room of your choice. Whilst it may not be as compact as a mattress-in-a-box, it does mean it’s ready to use right away and you don’t have to waste your energy trying to lug the box around. 

This mattress comes with a 120 night trial period but you do have to pay a $99 return fee if you change your mind. The Saatva comes in a twin, twin xl, full, queen, king and cal King and price ranges between $699 and $1599. You also have a choice of depth between 11” or 14.5”.

This is classed as the best-sprung mattress because it’s comprised of three layers. The first layer being a 1.25-inch layer of foam known as a euro-style pillow top which aids pressure relief and gives the mattress a more luxurious feel. The next layer is split between memory foam and coils and the final layer is made up of 7-inch steel hourglass-shaped support coils. 

The coils provide support, prevent sagging and help with the air circulation, making it feel comfortable and luxurious all at the same time. If you’ve ever wondered what mattress you should buy to get that luxury hotel feel, then this is the one. 

8. Nectar Mattress: Best mattress online for value

Best mattress: the Nectar Mattress performs well for the smaller price tag

(Image credit: Nectar)

Nectar Mattress

Smaller budget? This is the best mattress for sheer value


Sizes: Twin to Cal King | Filling: Hyper-elastic polymer | Comfort: High | Trial period: 365 days | Full refund: Yes | Weight in box: 105Ibs

Reasons to Buy

365-night trial!
Comfortable and supportive

Reasons to Avoid

Some may find it too firm
Can sleep hot

In our opinion, Nectar is one of the best value mattresses on the market. The sizes are twin, twin XL. full, queen, king and cal king. Prices start at $499 with the most expensive in the range the king and Cal king coming in at just $899. It’s certainly cheaper than most of its rivals and that doesn’t mean that it compromises comfort. 

This mattress also comes with a whopping 365-night trial period and should you not fall in love with this mattress within the first year, they’ll collect it and issue a full refund, no questions asked. 

The mattress itself offers a medium-firm comfort and is constructed of five-layers starting with a cooling cover which promotes air circulation and is bed bug resistant. The next layer is a quilted gel memory foam which will contour your body, then you have a gel memory foam layer which will help distribute weight evenly and provide pressure relief. Followed by two layers of hi-density memory foam to support the body and provide a stable foundation. 

The other thing that we really loved about this mattress is that it can hold up to a combined weight of 800lbs. So if you’re a heavy sleeper, it won’t sag or dip too much and still provide adequate pressure relief. 

9. Leesa Original: Best mattress for side sleepers

Best Mattress: the Leesa mattress is superb for side-sleepers

(Image credit: Leesa)

Leesa Original Mattress

Dominant side sleepers, the Leesa is a good mattress choice for you


Sizes: Twin to Cal King | Filling: Memory foam and foam | Comfort: Medium | Trial period: 100 days | Full refund: Yes | Weight in box: 76Ibs

Reasons to Buy

Soft to sleep on
Excellent for side sleepers

Reasons to Avoid

Can’t be used with a box spring base
Not suitable for heavy sleepers

This foam mattress is composed of Avena foam, memory foam and base foam, making the Leesa one of the softer-feeling mattresses we tested, which is perfect for those who tend to sleep on their side. The mattress did have a gassy smell for a longer period than other mattresses we tested and we could still smell the plastic after a week, although it became less prominent as the time went by. 

The Leesa comes in sizes twin, twin XL, full, queen, king, and cal king. Prices start from $599 for a twin and the King and cal King is $1199. The Leesa Original is 10” in depth a the first layer is a 2” Avena foam followed by 2” of memory foam and finally, 6” of base polyfoam that acts as the mattress’ support layer. The top layer is designed to be breathable so the bed doesn’t get too hot which is common with all-foam mattresses. 

The Leesa is also extremely good for motion isolation as the foam means you won’t feel your partner fidgeting or getting up. For the price, this is certainly the best mattress for side sleepers thanks to the soft feel of the Avena foam alongside the supportive memory foam base layers.

10. Casper Hybrid: Best mattress in a box for firm support

Best mattress online: the Casper Hybrid Mattress is made from springs and memory foam

(Image credit: Casper Mattress)

Casper Hybrid Mattress

A spring and memory foam mattress to enjoy the best of both worlds


Sizes: Twin to Cal King | Filling: Springs and memory foam | Comfort: High | Trial period: 100 days | Full refund: Yes | Weight in box: 99Ibs

Reasons to Buy

Enhanced edge support 
Great for back and side sleepers
Provides pressure relief

Reasons to Avoid

Some may find the springs too bouncy

For those who like memory foam but are not ready to give up on their springs just yet, the Casper Hybrid is the perfect solution. This mattress combines springs that relieve pressure on your joints and back whilst providing three layers of foam for comfort. We found that this is particularly good for those who suffer aches and pains and need to feel as though they have added support, especially those who sleep on their backs. 

The Casper Hybrid comes in sizes Twin, Twin XL, Full, Queen, King, and Cal King. The RRP starts at $795 for a twin and goes up to $1,395 for a king or Cal king. Whilst we know these prices are slightly steeper than other hybrid mattresses you can purchase online, Casper is very good at running multiple promotions throughout the year so there are always bargains to be had. 

It’s also worth noting that the Casper Hybrid is only around $200 more than the all-memory foam original Casper but you are getting a lot more support for that money and in our opinion, it’s a better all-round mattress and worth the extra dollars. 

This is the best hybrid mattress because it’s made up of four-layers with three foam layers on top of a layer of 7-inch pocket springs. The edge to edge support is superb and a lot firmer than many of the rival hybrid beds meaning it’s a comfortable bed if you like to sleep on the edge or you struggle to get in and out of your bed. 

This mattress is suited to back and side sleepers, we found it was less comfortable when front sleeping. It also provides excellent relief on aching joints and back pain thanks to the combination of foam and springs. 

The firmness rate is around 8, so it is better suited to customers who like a firm mattress but because of the springs, it does have a certain bounce that may appeal to those who like a medium-firm mattress. 

Casper often runs sales on its mattresses, so be sure to check out our round-up of the best Casper mattress deals and discount codes to see how much you could save - or if there are any free gifts available when purchasing a Casper. 

11. Brooklyn Signature: Best online mattress for hotel-level comfort

Best mattress online: Brooklyn Signature Mattress

(Image credit: Brooklyn)

Brooklyn Signature Mattress

The best mattress online for a hotel bed feel


Sizes: Twin to Cal King | Filling: Memory foam, hyper-elastic foam and pocket springs | Comfort: Medium | Trial period: 120 days | Full refund: Yes | Weight in box: 98.8Ibs

Reasons to Buy

Cooling design
Choice of firmness settings
120-night trial period

Reasons to Avoid

You may prefer a bouncier bed

If you’re anything like me then you’ll know what a nightmare it is to own a mattress that holds the heat. Thankfully, the Brooklyn Signature is designed to help sleepers stay cool so they can wake up refreshed the next morning. 

The top layer of the mattress being infused with TitaniumGel and the additional airflow created via the pocketed coil layer. This helps the entire mattress maintain a comfortable temperature no matter what the weather. 

It’s also a great mattress for any type of sleeper and perfect for those who love the feel of memory foam but need the support of a sprung mattress. The Brooklyn Signature Hybrid is made up of four layers of foam and pocketed coils. The base layer is 1” of dense support foam with 6” of individually pocketed coils sitting on top. 

There is then a 2” layer of TitanFlex support foam - this layer differs slightly depending on your chosen thickness levels. Finally, the top layer is the TitanFlex Comfort layer which is a patented hyper-elastic propriety foam that is soft but still responsive. 

It comes in a range of sizes including twin, twin XL, full, queen, king, and Cal King. The RRP prices range from $599 to $1,249 making it a reasonable price for a Hybrid mattress of this quality. We found this mattress extremely comfortable to sleep on, it’s perfect for couples, especially if one of you is a fidgeter or gets hot overnight.

Best mattress online FAQ

How to choose the best mattress online for you

Factors such as whether you sleep on your side, back or stomach, whether you share a bed with a partner and even your weight and height should be things you consider before you make your next mattress purchase. 

Firmness is another thing that you should factor in, usually a firmer mattress suits heavier sleepers or those who sleep on their front or back. Medium firmness is suited to those who need extra support for their spine, back and neck. Whilst those who are side sleepers benefit from a softer mattress that will mold to your body’s natural curvature. 

If you share a bed then you’ll want to opt for a mattress that has limited motion transfer. Not everyone sleeps the same so if you’re sharing with a partner who gets up and down a lot or tosses and turns, the last thing you want is a spring mattress as they can be bad for motion transfer, whilst memory foam mattresses are great at limiting movement.

What is the best mattress online for back pain?

Back and joint pain can be made worse by choosing a bad mattress. As we mentioned above, firmness plays a big part in making sure that the mattress provides enough support to keep the spine and neck in a neutral position all night. 

The majority of mattress companies now realize how important it is to design their mattresses to promote good health so in our reviews we cover which mattresses are best for joint and back pain quite extensively. 

If you are experiencing pain, it's easy to get anxious about not being able to sleep because of it. To help you relax before bed, we'd recommend downloading one of the best meditation apps, or learning how to stop anxiety ruining your sleep

Best mattress: sites often show you what is inside their mattresses

(Image credit: Brooklyn Mattress)

What are the best mattresses made from?

This guide focuses primarily on mattresses that are either memory foam or hybrids meaning that it’s a combination of foam, latex, and coils. These are now the most popular and in our opinion, the best mattresses on the market. 

Memory foam mattresses are good for providing pressure point relief and are ideal for lighter and side sleepers. They hug your body and bounce back once you get up. They do tend to be hot although a lot of the companies we recommend offer cooling technology so that you don’t overheat. 

Spring and coil mattresses provide a little more bounce. When they are combined with memory foam, they can promote good air circulation and also help with distributing body weight evenly as well as providing good motion transfer isolation.

How much do the best mattresses online cost?

Mattress prices vary wildly depending on the company that you choose and of course, what discounts are available at the time. We always recommend putting quality above price, we know that’s easy to say but a mattress is an investment in your health. 

How to get the best mattress online deals

We love finding the best deals on mattresses here, and our prices update daily, so if you’re looking to get the best mattress deal possible, it’s worth bookmarking this site so that you get the best prices without having to go searching all the sites yourself. 

Mattress companies have regular sales throughout the year. Whilst some companies such as Purple and Saatva don’t ever discount their mattresses, they do often have deals on free accessories when you make your purchases. Waiting for the sales can often save you up to $200 dollars, if not more during big sales events.