Best Simba mattress toppers

“If your mattress is sound but feels too hard, the Simba Hybrid Topper is the one we would buy, because it packs the most springs in the range into its 6.5cm. Choose the Hybrid Essential instead if the price decides it, since it keeps the same four-layer, medium-firm spring design for less.”

Should you choose springs or foam?

Two of Simba’s toppers are hybrids. The Hybrid and the Hybrid Essential put a layer of 20mm Aerocoil microsprings, up to 1,900 and up to 1,500 respectively, between Simbatex foam and a high-density foam base. The springs compress as you move, so the layer gives under the shoulder and hip and then pushes back. The Cool Foam drops the springs and rests its Simbatex layer on a contoured foam base instead, which makes it the lighter and cheaper option but also the one heavier sleepers will sink into furthest.

All three are rated medium-firm by Simba. That suits most people who want to take the edge off a hard mattress, and it matches the research: a systematic review of 24 controlled trials (Radwan et al., Sleep Health, 2015) found that mattresses rated medium-firm gave the best results for sleep comfort, quality and spinal alignment. If you want a noticeably softer bed, a 6.5cm medium-firm topper will change the feel less than a deeper one such as the 9cm Emma Original Pro, or the softer memory foam and wool layers in our best mattress toppers ranking.

Will a Simba topper fix your mattress?

Only if the mattress underneath is still in good shape. Bed Advice UK, the consumer site of the National Bed Federation, puts it plainly in its guide to buying a mattress topper: “A mattress topper isn’t a quick fix for a mattress that’s past its prime.” The same guide says a topper should be at least 5cm deep to make a noticeable difference, which every Simba topper clears at 6.5cm. On a mattress with dips, though, the topper settles into the same hollows.

Age is the other test. Bed Advice UK says sleep experts recommend replacing a mattress every seven years. If yours is older than that or visibly sagging, the money is better spent on one of the Simba mattresses we compare, which build the same Aerocoil springs into a full-depth mattress.

How much do the cooling claims matter?

Heat is worth taking seriously. A review in the Journal of Physiological Anthropology (Okamoto-Mizuno and Mizuno, 2012) found that in real-life conditions, with bedding, heat exposure increases wakefulness and reduces slow-wave and REM sleep. Simba says its Simbatex foam has over five times the airflow of memory foam, based on Intertek tests it commissioned in May 2025 against nine memory foams. That is the maker’s own figure, so treat it as a direction rather than a measurement of your bed. The Cool Foam adds graphite to the foam, and in the hybrids Simba says the springs push air up through the layer as they compress.

Price per UK size, and where you buy

Simba sells its toppers only in the five UK sizes, so there is no 90x200 or 140x200 option, unlike some of its mattresses. The table shows regular prices at each brand’s own shop on 4 October 2026.

Where you buy matters as much as the size. Simba’s guarantee page gives 10 years automatically when you buy from simbasleep.com, while a Simba bought through one of its authorised retailers, a list that includes John Lewis, Dunelm, Argos and Bensons, starts at five years and has to be registered with Simba to reach ten.