1 5
Best For All Positions
Helps with Disturbance
Helps with Allergies
Helps with Pressure Relief
Thermal Control All Season
 

One Third

Deep Sleep Premium Mattress

Deep Sleep Premium Mattress

£849.00 GBP
£949.00 GBP £849.00 GBP
Sale Sold out
Taxes included. Shipping calculated at checkout.
1000 Mirapocket Springs
Memory Foam
28cm Depth
Vitalize Cover
Single Sided
Firmness: Medium
5 Year Guarantee
Size
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Description

Overview
  • Vitalize sleep surface
  • Memory foam
  • High-Density foam for cooler sleep
  • Mirapocket Springs
Onethird’s mattress combines the latest technology with renowned materials and support systems to deliver a better night’s rest. Wave goodbye to poor sleep quality and hello to feeling refreshed and reinvigorated every morning. 

1000 pocket springs

Make the most of the mattress’s impressive 1000 pocket springs and rely on a tailored night’s rest every time your head hits the pillow. Unlike a traditional coil base, these springs react independently from one another and from any pressure applied to the mattress. This ensures relief from minor aches and pains and targeted support throughout the night. We find pocket springs popular among those who share a bed. Do your partner’s movements ever disrupt your sleep? The OneThird mattress could be the perfect answer. These springs react separately from one another, so tossing and turning elsewhere won’t impact your rest. 

State-of-the-art technology

The latest technology goes into ensuring you receive the best night’s sleep possible every night. This doesn’t just mean eight hours of shut-eye but instead a focus on the actual quality of your sleep. Onethird’s clever Vitalize technology stimulates your metabolism and enhances blood circulation, promoting better overall sleep and well-being. This innovative feature supports healthier rest by optimising the body's natural processes during sleep. The Vitalize sleep surface absorbs body heat and reflects this lost energy back into your body.Regardless of how tired you are or how comfortable your mattress is, sometimes it’s just too hot to sleep. These are the moments you crave a crisp and cool surface, allowing you to drift off to a peaceful slumber. The OneThird mattress features ReVo™ technology, comprising an open-cell structure for optimal comfort and better body support. With this in mind, wave goodbye to hot and stuffy flights and wake every morning refreshed and ready for the day ahead.

What else can I benefit from?

One of the many things we love about the OneThird mattress is how spacious it is. With many mattresses, you’re not able to sprawl across the bed or sleep on the edge for fear of dips occurring. However, the Just Calm mattress is finished with a supportive foam border around the base and sides of the mattress. This allows you to sleep all the way to the edge of the mattress without feeling like you’re going to ‘roll off’.

Conveniently, the mattress arrives in a box, meaning it's straightforward to set up.

Will this mattress suit my sleeping position?

The OneThird mattress features a medium tension, which is perfect for side sleepers who will benefit from cushioned hip and shoulder support. For complete peace of mind, purchase a mattress protector alongside your new mattress and qualify for our 60-night sleep trial. 

Disclaimer: Each mattress spec is reflected in the description and details on the page, Please note however that the outside cover can sometimes be a bit different to the images reflecting on the season and time of year

Delivery

We provide our award-winning Free Next Day Delivery service to most locations, sending a proper night’s sleep out far and wide. Hassle-free and convenient, you can even choose a time and day that suits you, have us take your old mattress away for recycling, and get us to deliver to your room of choice!

In some places, a small fee will be charged to help us get you your best night’s rest as quickly as possible. Take a look at the following postcodes to see if this applies to you, and if you’re not sure, then use our helpful Postcode Checker to help you shop with confidence.

  • AB10-AB16, AB21-AB25, AB30-AB39, AB41-AB45, AB51-AB56
  • CA1-CA9
  • DD1-DD11
  • DG1-DG14, DG16
  • EH1-EH49, EH51-EH55, EH91, EH95, EH99
  • FK1-FK21
  • G1-G5, G9, G11-G15, G20-G23, G31-G34, G40-G46, G51-G53, G58, G60-G79, G18-G84, G90
  • IV1-IV19, IV30-IV32, IV36
  • KA1-KA30
  • KY1-KY16, KY99
  • LA1-LA7
  • ML1-ML12
  • PH1-PH26
  • TD1-TD15

30 Night Sleep Trial

Sleep on your new mattress in the comfort of your home for a full 30 nights. Take your time to feel the support, comfort, and pressure relief it provides.

If you’re not completely satisfied within the trial period, you can return or exchange it with no hassle and no stress.

We want you to be confident that your mattress is the perfect match for your sleep.

Warranty & Guarantee

Rest easy knowing your mattress is protected with our 5-year warranty. Crafted with quality materials and long-lasting comfort in mind, your mattress is designed to stay supportive night after night.

If any manufacturing faults or defects appear within the warranty period, we’ll repair or replace your mattress — no hassle, no extra cost.

Your comfort and peace of mind are always guaranteed.

Why Choose One Third

3 Year Warranty & 30 Night Trial

We're committed to your satisfaction and offer a 3 Year Warranty & 30 Night Trial on all products. If you're not happy with the product, within 30 days of your purchase, we'll refund your money and pick up the bed at NO cost to you

Complete Buyer Protection

Buy with confidence with PayPal, pay in installments or pay cash on delivery. We offer a variety of payment methods to suit your needs

Made in Britain – Comfort Delivered Fast

Enjoy your new mattress in no time with zero hassle. All our mattresses arrive ready to use — simply unbox, let it expand, and relax. No tools, no complicated setup, and no DIY expertise required.

Designed and manufactured in Britain for comfort, quality, and convenience.