Description
Experience sleep like never before with the OneThird Luxury 4000 Pocket Mattress.
Top-rated!
Here at Mattress Online, we've given this mattress our own stamp of approval as it's one of our Top Picks for 2025! We're confident you'll love this mattress and everything it has to offer, so why not treat yourself today.
Luxury Hampshire wool
Luxury have carefully selected Hampshire fleece wool for this stunning mattress. A unique, single black Hampshire wool tuft signifies the inclusion of this premium wool inside.
Locally sourced from Hampshire lambs, this wool is thicker, fuller and more resilient than standard wool - for a more comfortable night's sleep, the natural way.
Naturally breathable, wool is the ideal comfort material to keep you warm in winter and cool in summer. Blended with layers of English cotton, the Wool Luxury 4000 is truly luxurious.
Traditionally hand-tufted, this mattress locks in all the plush comfort and provides enhanced support.
Pocket sprung support
Good postural support is essential for a healthy night's sleep. The Wool Luxury 4000 features a remarkable 4000 pocket spring system with a ErgoZone 7 design. The zoned design offers firmer support around your hips, head and feet. This firmer feel is achieved through thicker gauge wires with stronger tension. The design stops these areas of your body from sinking in and resulting in an uncomfortable sleep posture. The softer zones offer lighter support and optimise the sumptuous feeling without compromise. Designed to respond to your pressure points to deliver ultimate comfort and promote natural spinal alignment.
Since each pocket spring is individually encased, they actively work throughout the night to support your body with highly responsive and targeted support. Pocket springs are considered a superior spring system - and for good reason! There's no roll-together or roll-off, and you won't feel your partner's movements as you sleep. It's the perfect recipe for a peaceful night's sleep.
Optimised sleep space
Maximised sleeping space is a must for a good night's sleep - whether you sleep with your partner or you get the bed to yourself!
Complete with metal rods that sit above and below the pocket spring unit and are held in place with butterfly clips. This design reinforced the durability and stability of the mattress edge to stop it from sinking when met with weight or pressure. So you can enjoy edge-to-edge support without a 'roll off' feel.
Stylish design
The Wool Luxury 4000 is finished with a beautifully soft-touch cotton-viscose fabric cover. It'll become a stunning feature in your bedroom and it truly looks as good as it feels.
Easy care for your convenience
Complete with built-in turning handles, it's easy to move your new mattress. As it's double-sided, we recommend that you flip your mattress regularly to keep it in great condition.
Quality you can trust
Handmade by expert craftspeople in the UK, this mattress has been produced to the highest standards. The cover is infused with M-Pure, a 100% natural, plant-based treatment that's naturally fire resistant.
Sleep soundly: it's approved by the National Bed Federation, too!
10 Year Warranty
This Onethird mattress comes with a 5 Year Warranty. In order to benefit from this warranty, please ensure that you register your new product within 60 days of your purchase date.
Benefits
- A Top Pick for 2025!
- Featuring blissfully comfortable layers of 100% Hampshire fleece wool
- Zoned in 7 areas for ideal, comforting full-body support
- A medium-firm, supportive feel
- Handcrafted for your comfort: this speciality wool is chosen for its premium feel
- For that fresh feeling every night - wool is a highly breathable, natural material
- Blended with layers of English cotton for luxurious comfort
- An impressive 4000 individually hand-nested pocket springs provide tailored support
- All wrapped up in a soft-touch, natural cotton-viscose cover
- 100% sustainable, plant-based M-Pure cover treatment is environmentally friendly
- The cover is naturally fire-resistant without the use of harsh chemicals
- Reinforced border with metal rod support and butterfly clips so you can sleep to the edge without a 'roll off' feel
- Traditionally hand-tufted for long-lasting support
- Double-sided design enhances mattress longevity
- Easy to turn over using the built-in turning handles
- Depth: 28cm
- Handmade in the UK
- 5 Year Warranty
Weights: Single: 40kg, Small Double: 60kg, Double: 65kg, King Size: 70kg, European King Size: 75kg, Superking: 80kg, Superking Zip and Link: 80kg
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.