Simba's 6.5cm all-foam topper pairs graphite Simbatex foam with a contoured base, a cooler medium-firm layer at the lowest Simba price.
The Simba Cool Foam Mattress Topper is a 6.5cm, three-layer foam topper built around graphite-infused Simbatex foam and a contoured, peaked foam base that leaves air channels underneath. It has no springs, which makes it the cheapest Simba topper, from a regular £149 for a single, with a medium-firm feel we place at 6 out of 10.
| Layer | Material | What it does |
|---|---|---|
| 1. Cover | Soft knitted cover | Removes for washing at 40°C |
| 2. Comfort | Simbatex CertiPUR foam infused with graphite | Cushioning that moves warmth away |
| 3. Base | Higher-density contoured CertiPUR foam, slip-limiting base and elastic straps | Egg-shaped peaks let air circulate |
The layers are listed on Simba’s UK product page.
Simba’s headline figure is that Simbatex has over five times the airflow of memory foam. It comes from Intertek tests from May 2025, cited by Simba, on nine memory foams from the top three UK manufacturers, so read it as a manufacturer claim. The design logic is sound: open-structure foam and an air-channelled base trap less heat than dense memory foam, and heat is a real sleep problem. A review in the Journal of Physiological Anthropology (Okamoto-Mizuno and Mizuno, 2012) found that heat exposure with normal bedding increases wakefulness and reduces slow-wave and REM sleep.
Warm sleepers who want to soften a firm mattress, and anyone on a budget. A single costs half as much as the Hybrid Topper. You give up the Aerocoil springs, so the surface is less responsive and a heavier sleeper will sink further into it. As with any topper, it will not fix a mattress that has already sagged. It has three layers rather than the four of Simba’s spring toppers, at the same 6.5cm depth. It is sold in five UK sizes, single to super king, and the elastic straps and slip-limiting base keep it from creeping across the mattress. The cover zips off and washes at 40°C.
All three Simba toppers share the 6.5cm depth, the elastic straps and the 200-night trial. What the extra money buys is the spring layer, and the Cool Foam is the only one without it.
| Topper | Depth (cm) | Layers | Aerocoil springs | Single | Double |
|---|---|---|---|---|---|
| Simba Cool Foam Mattress Topper | 6.5 | 3 | None | £149 | £199 |
| Simba Hybrid Essential Mattress Topper | 6.5 | 4 | Up to 1,500 | £249 | £299 |
| Simba Hybrid Mattress Topper | 6.5 | 4 | Up to 1,900 | £299 | £349 |
| Size | Dimensions (cm) | Regular price |
|---|---|---|
| Single | 90 x 190 | £149 |
| Small double | 120 x 190 | £199 |
| Double | 135 x 190 | £199 |
| King | 150 x 200 | £249 |
| Super king | 180 x 200 | £299 |
Regular prices at the time of writing (September 2026). The topper is made in the UK, its foams are certified under the EUROPUR CertiPUR programme (no mercury, lead or cadmium, low VOC emissions), and it ships free next day if ordered by 1pm, with a 200-night trial and a 10-year guarantee.
| Brand | Simba |
|---|---|
| Material | Supersoft knitted cover over a Simbatex open-cell foam comfort layer and a higher-density contoured CertiPUR foam base. Cover removes for machine washing. |
| Made in | United Kingdom |
| Firmness | Medium firm (6/10) |
| Height | 6.5 cm |
| Sleep trial | 200 nights |
| Warranty | 10 years |
| Delivery | Free next-day delivery, UK mainland |
| Available sizes | 90x190, 120x190, 135x190, 150x200, 180x200 |
| Overall score | 8.0/10 |
| Certifications | CertiPUR |
“The Cool Foam Topper is the one to buy if you sleep warm and want Simba quality for half the price of the Hybrid Topper. Heavier sleepers and anyone who likes a bouncy surface should pay more for a spring topper.”
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