Emma, Eve or Casper? The top five boxed mattresses for 2021

Table last checked: April 2021

Bed-in-a-box mattress brands

Want to know more about the brands selling mattresses online? Read on for our round-up of the key information you'll need to know. 

Emma

Emma offers three bed-in-a-box mattresses. The Emma Original is comprised of foam and memory foam, the Emma Hybrid contains a combination of foam, memory foam and pocket springs. And, most recently, the Emma Original Hybrid has joined the range.

• Costs: Emma Original: Single: £429, Double: £649, King: £729, Super King: £829
• Delivery: Free shipping and free returns in the UK
• Trial: 200 nights. If you decide to return the mattress, Emma will collect it free of charge and offer a full refund
• Guarantee: 10-year limited warranty on the mattress core
• Other products available: pillow, mattress protector, cot mattress

See our full Emma Original mattress review to see whether it really can offer full support.

Eve

With its bright yellow trim, the Eve mattress range is certainly bound to catch your eye. We've tested five Eve mattresses, including the Even Original Hybrid, the Premium Hybrid and The Eve Original. This mattress is made of a 3cm memory foam layer, 3cm cooling foam layer and 18cm supportive foam base.

Eve mattresses are actually on display in various branches of high street retailers, usually, such as Next Home, so it's worth checking to see if there's a display model near you - if shops are open.

• Costs: The Original mattress - Single: £429, Double: £699, King £799, Super King: £899 (0% APR finance packages are available)
• Delivery: Free standard 3-day delivery, next-day express delivery available for £15
• Trial: 100 nights. If you decide to return the mattress, Eve will collect it free of charge and offer a full refund
• Existing mattress removal: Available for an additional £40 fee, after the delivery of your Eve mattress
• Guarantee: 10-year limited warranty covering manufacturing faults
• Other products available: cot mattress, pillow, mattress topper, mattress protector, bed frame, bedding (two bundles available)

See how it performed in our tests by reading our full Eve mattress review.

Otty

Otty claims that its Otty double hybrid mattress has a patented memory foam/foam/pocket spring combination eliminates over-heating with a cool gel and airflow technology.

• Costs: Single: £499, Double: £699, UK King £799, Super King: £899 (0% financing available)
• Delivery: Free shipping, £30 for premium shipping including allocated day and Saturday delivery, and free returns
• Trial: 100 nights. If you decide to return the mattress, Otty will offer a full refund
• Existing mattress removal: Optional, depending on your area
• Guarantee: 10-year limited warranty
• Other products available: Pillow and pet bed

See how it does in our tests, including how breathable the mattress is, by reading our full Otty mattress review.

Silentnight

Silentnight has a bigger range of deliverable mattresses, including pocket-sprung, latex and memory foam options. If you like trying out a mattress before buying, Silentnight is one of the few online mattress brands to be on display in a large number of retailers - including Bensons for Beds, Dreams, Furniture Village and John Lewis, when open. 

• Costs: Doubles range from £125-£729 depending on the model. Its hero boxed model, the Silentnight Studio, costs: single: £399, double: £599, King: £699 (financing available)
• Delivery: Free 3-5 day shipping for all mattresses
• Trial: 60 nights. If you decide to return the mattress, Silentnight will give the option of exchanging your mattress for another, but won't offer a full refund
• Existing mattress removal: Optional, depending on your area
• Guarantee: 5-year limited warranty
• Other products available: Beds, bedding, pillows and duvets

See our full list of Silentnight mattress reviews and find out how our members rate them by reading our guide to Silentnight mattresses.

Simba

One of the stalwarts of the bed-in-a-box mattress market, Simba prides itself on its combination of memory foam, foam and pocket springs. Its mattresses are available to try in a number of retailers, including John Lewis and Furniture Village, when open, but also come with a 200-night trial direct from Simba. We've also spotted Simba are offering a new customer deal, with money off mattresses.

• Costs: Simba Hybrid: Single: £589, Double: £799, King: £909, Super King: £1009; (0% finance packages available)
• Delivery: Delivering in up to three to five business days
• Trial: 200 nights. If you decide to return the mattress, Simba will offer a full refund
• Existing mattress removal: Optional with premium delivery
• Guarantee: 10-year limited warranty covering manufacturer faults
• Other products available: Bunk-bed mattress, pillows, duvets, mattress protector, adjustable bed base, fitted sheet, sleep spray, slippers (three bundles available)

Read our full Simba Hybrid mattress review to see how it performs in our lab.

Casper

Casper was one of the biggest players in the bed-in-a-box market, but in June 2020 it stopped selling mattresses directly to UK consumers. Casper mattresses can now be bought from mattressonline.co.uk instead.

• Costs: Casper Essentials: Single: £325, Double: £500, King: £550; Casper Original: Single: £500, Double: £750, King: £900; Casper Hybrid: Single: £625, Double: £900, King: £1000.
• Delivery: Free next day delivery
• Trial: mattressonline.co.uk is offering a 60-night sleep trial. If you don't love the mattress you can exchange for any other mattress
• Existing mattress removal: Optional extra (£25)
• Guarantee: 10-year limited warranty covering manufacturer faults
• Other products available: Pillows

Which? bed in a box mattress reviews

If you’re looking for a great night’s sleep, look no further than our independent and objective mattress reviews. You can have complete confidence in our reviews and test scores because every mattress review we publish is based on the most rigorous lab tests.

It’s essential that your mattress gives your spine the support it needs. That’s why we test each one to see how well it will support people of various sizes, sleeping on both back and side.

After simulating up to 10 years of use by rolling a heavy barrel over the mattress thousands of times, we then repeat the body-support tests to see whether the mattress becomes less supportive over time. We also assess the mattress for any change in height or firmness, so we can tell you whether a mattress will sag or soften after a few years of use.

That’s not all. Our testing also reveals how breathable a mattress is, how easy it is to turn over on and how stable it is. Light sleepers should try and buy a mattress with five stars for stability. These are the best at absorbing bounces, so you’ll be less likely to be disturbed when your partner rolls over or gets up in the night.

If you’re not yet a member and want access to all these results and more, join Which? today.

Price checked: April 2021.

Full RRP price quoted at the time of writing. Prices may change.