Simba's flagship 6.5cm topper combines up to 1,900 Aerocoil microsprings with Simbatex foam for a responsive, medium-firm surface.
The Simba Hybrid Mattress Topper is a 6.5cm, four-layer topper that puts up to 1,900 Aerocoil microsprings between a Simbatex foam comfort layer and a high-density foam base. It is the top model in Simba’s topper range, rated medium-firm (6 out of 10 on our scale), with a regular price from £299 for a single.
| Layer | Material | What it does |
|---|---|---|
| 1. Cover | Plush knitted cover | Removes for washing at 40°C |
| 2. Comfort | Simbatex open-structure CertiPUR foam | Cushioning with airflow |
| 3. Springs | Up to 1,900 20mm Aerocoil springs in polyester pockets | Responsive support, push air upwards |
| 4. Base | High-resilience, high-density CertiPUR foam, slip-limiting base and elastic straps | Stability and a secure fit |
The build is listed on Simba’s UK product page. The headline depth is 6.5cm, although the size table rounds it to 7cm. Springs are the unusual part: most toppers are foam, feather or wool only. Simba says the springs are the size of a paperclip, so you feel responsiveness rather than coils.
That is its main pitch. Simba states that Simbatex has over five times the airflow of memory foam, based on Intertek tests from May 2025 that Simba cites, run against nine memory foams from the top three UK manufacturers, so the figure is a manufacturer claim rather than an independent result. The reason it matters is well documented: a review in the Journal of Physiological Anthropology (Okamoto-Mizuno and Mizuno, 2012) found that heat exposure in real sleeping conditions increases wakefulness and cuts slow-wave and REM sleep.
Sleepers who want to make a firm or tired mattress feel more responsive, and guest rooms where the topper can be rolled away. It costs 20% more than the Hybrid Essential Topper in a single for 400 extra springs and a plusher cover. A topper cannot fix a sagging mattress, though, and it is heavier than a foam topper. It is sold in the five UK sizes only, from single to super king, so there is no option for a continental 140x200 or 160x200 mattress.
| Size | Dimensions (cm) | Regular price |
|---|---|---|
| Single | 90 x 190 | £299 |
| Small double | 120 x 190 | £349 |
| Double | 135 x 190 | £349 |
| King | 150 x 200 | £399 |
| Super king | 180 x 200 | £499 |
Regular prices at the time of writing (September 2026). All Simba toppers are made in the UK, the foams are certified under the EUROPUR CertiPUR programme for foam without heavy metals and with low VOC emissions, and the topper comes with free next-day delivery if ordered by 1pm, a 200-night trial and a 10-year guarantee.
| Brand | Simba |
|---|---|
| Material | Supersoft sleep surface, Simbatex open-cell foam comfort layer, up to 1,900 20mm Aerocoil micro-springs in a polyester pocket and a high-density 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 | 8.3/10 |
| Certifications | CertiPUR |
“Choose the Hybrid Topper if you want the most cushioned and responsive Simba topper and the 200-night trial reassures you on the price. If budget matters more, the Hybrid Essential Topper gives you the same spring-and-foam idea for about 17% less in a single.”
Also compared
The Emma Original Pro Topper is a 9 cm graphite-foam topper we tested: supportive,…
Firmness: Medium firm · 100-night sleep trial
Simba's 6.5cm all-foam topper pairs graphite Simbatex foam with a contoured base, a cooler…
Firmness: Medium firm · 200-night sleep trial
The Woolroom Deluxe is a 4-5 cm topper filled with 1,000gsm of traceable British…
Firmness: Medium soft · 30-night sleep trial
