The Soak&Sleep Waterproof Coolmax Mattress Protector pairs a Coolmax-blend quilted top with an edge-to-edge TPU waterproof base and 35cm skirt.
No firmness rating from the manufacturer.
The Soak&Sleep Waterproof Coolmax Mattress Protector is a quilted, fitted protector with a 40% Coolmax and 60% polyester top, a plump polyester fill and an edge-to-edge TPU waterproof base, held on by a 35cm elasticated jersey skirt. It is sold in seven sizes from single to emperor, singly or in packs of two.
| Layer | Material (seller spec) | Purpose |
|---|---|---|
| Top fabric | 40% Coolmax, 60% polyester | Moves moisture away, cool, rustle-free |
| Filling | Quilted polyester | Adds a layer of cushioning |
| Base | TPU waterproof layer, edge to edge | Stops spills reaching the mattress |
| Skirt | Elasticated jersey, 35cm deep | Fits most mattress depths |
Two details on the product page are worth knowing. The TPU base is attached only at its edges and left unquilted, so there are no stitch holes for liquid to leak through. And Soak&Sleep is candid that liquid left in the protector for a long time will eventually seep to the edges, so it should come off the bed promptly after an accident.
Coolmax is a polyester fibre brand from The LYCRA Company, which says the fibre’s moisture-wicking performance is built in and will not wash out. On a protector, that means sweat moves through the top layer instead of sitting against your skin, which is the usual complaint about waterproof protectors. Soak&Sleep pitches it at well-insulated homes and summer nights. For reference, the Sleep Charity recommends a bedroom of around 16 to 18°C.
| Size | Dimensions | One protector | Pack of two |
|---|---|---|---|
| Single | 90 x 190cm | £38 | £72 |
| Euro single | 90 x 200cm | £38 | Not sold |
| Small double | 120 x 190cm | £48 | £91 |
| Double | 135 x 190cm | £48 | £91 |
| King | 150 x 200cm | £58 | £110 |
| Super king | 180 x 200cm | £68 | £129 |
| Emperor | 200 x 200cm | £70 | Not sold |
Prices were checked on soakandsleep.com in September 2026, with every size in stock. Soak&Sleep suggests two protectors per bed so one can be washed while the other is in use, and the two-packs cost slightly less per protector.
The care label allows 40°C, and Soak&Sleep suggests washing every three to four weeks. If you are buying mainly for a dust-mite allergy, note that the NHS advises people with allergic rhinitis to wash bedding regularly at 60°C and above, which this protector cannot take.
The protector carries a two-year guarantee, the maximum Soak&Sleep offers on protectors, and unused items can be returned within 365 days under the returns policy. It was designed in the UK and is made in China. The practical case for a waterproof layer is on Soak&Sleep’s own returns page: a protector is a condition of its 100-night mattress trial, and marked or dirty mattresses are refused.
| Brand | Soak&Sleep |
|---|---|
| Material | 40% Coolmax and 60% polyester casing, quilted polyester fill, waterproof TPU base and an elasticated jersey skirt. |
| Made in | China |
| Warranty | 2 years |
| Delivery | Free over £70, otherwise £4.95 |
| Available sizes | 90x190, 90x200, 120x190, 135x190, 150x200, 180x200, 200x200 |
| Overall score | 8.3/10 |
“The Waterproof Coolmax protector is the pick for a warm sleeper who still needs a genuinely waterproof layer, and the two-packs make weekly washing practical. If dust-mite allergy is the main concern, note that its 40°C wash limit falls short of the 60°C the NHS advises for bedding.”
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