One of Sealy’s most popular models, the Advantage Sapphire Mattress makes use of both the innovative PostureTech CS spring system and a cushioned, gel-infused Geltex comfort layer to guarantee an unbeatable night’s sleep. Hand-crafted in the UK, the mattress also benefits from a luxurious pillowtop and is finished with the finest fabrics, so you enjoy absolute luxury whenever you hit the hay.
The mattress is topped with a plush pillowtop that adds an extra layer of luxury to an already supremely comfortable design. The Medium/Soft rating is fantastic if you don’t require too much support and is well suited to side sleepers. The mattress is also shipped with a five-year guarantee that ensures you’re able to invest in a good night’s sleep without having to worry about a thing.
Sealy's state of the art PostureTech CS spring system is designed to respond to shifts in body weight and provide localised support where you need it most. Each spring reacts subtly to your sleep movements, preventing disturbances on one side of the bed from spreading across the entire surface. The system also benefits from Edge Guard technology - a high-density foam strip placed on the inside of the spring - which prevents sagging, improves durability and extends the mattress' lifespan.
The Sealy Advantage Sapphire Mattress utilises the company’s comfort-enhancing Geltex technology. This gel-infused comfort layer relieves the pressure on the parts of your body that feel it most, preventing aches and pains. As it’s a highly breathable layer, it allows air to circulate freely throughout the mattress, helping regulate your temperature and preventing overheating.
All Sealy mattresses are handmade in the UK by the company’s talented artisans. Based in Cumbria, Sealy is renowned for its innovation and has consistently pushed the boundaries of sleep technology with its scientific approach. Considerable experience and expertise go into each design, which is reflected in the quality of every mattress it produces. Sealy are so confident of this, they offer at least a five-year guarantee on all of their mattresses.
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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.
Sealy 5 Year Guarantee
In the unlikely event of a defect in material or workmanship occurring within the 5 year guarantee period, we will arrange to repair or replace the item under complaint free of charge at our discretion.
Free delivery Tomorrow, 16th January
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Rated Excellent
Verified
Comfy, retains heat. All good quality.
Verified
Amazing mattress. Fabulous service. You never let us down
Verified
Very comfortable, actually feel that it does cool and offer a decent night's sleep
Sealy Anti-Allergy Pillow - 2 Pack
DreamEasy Luxury 10.5 Tog All Seasons Duvet
DreamEasy Luxury Quilted Mattress Protector
Sealy Airflow Memory Foam Pillow
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Award winning delivery
Planet-friendly disposals
Buy now, pay later with Klarna
18+, T&Cs apply, Credit subject to status
| Size | Imperial | Metric |
|---|---|---|
| Small Single | 2'6" x 6'3" | 75cm x 190cm |
| Single | 3' x 6'3" | 90cm x 190cm |
| Small Double | 4' x 6'3" | 120cm x 190cm |
| Double | 4'6" x 6'3" | 135cm x 190cm |
| King Size | 5' x 6'6" | 150cm x 200cm |
| Super King | 6' x 6'6" | 180cm x 200cm |
| European Small Single | 2'8" x 6'6" | 80cm x 200cm |
| European Single | 3' x 6'6" | 90cm x 200cm |
| European Double | 4'7" x 6'6" | 140cm x 200cm |
| European King Size | 5'3" x 6'6" | 160cm x 200cm |
All mattress sizes given are approximate and stated sizes refer to the sleeping surface only. Mattresses sizes may vary slightly from their stated dimensions due to manufacturing tolerances, please allow +/- 20mm.
You can spread the cost of purchases over £400 without any fees or interest thanks to our partnership with Klarna, a payment service provider.
Available payment options
18+, T&Cs apply, Credit subject to status. Bedsonline.biz Ltd is authorised and regulated by the Financial Conduct Authority (FCA FRN 710091) and acts as a credit intermediary and not a lender, offering credit products provided exclusively by Klarna Bank AB (publ). Finance is only available to permanent UK residents aged 18+, subject to status, terms and conditions apply. Klarna’s [Pay in 3 instalments] [and] [Pay in 30 days] are unregulated credit agreements.Borrowing more than you can afford or paying late may negatively impact your financial status and ability to obtain credit. 18+, UK residents only. Subject to status. Ts&Cs and late fees apply.
*Delivery charges may apply for some areas. Please see our delivery page for more information.
1. Order by 6pm for next day delivery between Monday-Friday, 12pm on Saturday and 3pm on Sunday. The 'Order by' time may be subject to change dependant on our delivery partners.
Bedsonline.biz Ltd is authorised and regulated by the Financial Conduct Authority (FCA FRN 710091) and acts as a credit intermediary and not a lender, offering credit products provided exclusively by Klarna Bank AB (publ). Finance is only available to permanent UK residents aged 18+, subject to status, terms and conditions apply.
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