Firmness
Type
Hybrid
Depth (cm)
25
Number of Layers
5
Trial Period (nights)
Warranty (years)
10
Price Range
£699 to £1,149
Best Sleeping Position(s)
Certifications
Assessed from the specification published by MattressNextDay, captured September 2026, and from regular price comparison across our UK retail partners.
This mattress makes sense if you want the contouring of foam but worry about sinking in or overheating. The ActivFlex spring foam works like pocket springs while moulding to your shape, so support follows your body at every point of contact rather than feeling flat and hard. Yes, it's a firm mattress, but the polyester pillow top softens the surface enough for comfort without undermining that support. It's also hypoallergenic and vegan friendly, which is rare in this category. The page at MattressNextDay lists a Sleepeezee 10-year guarantee, and the retailer offers free next day delivery to mainland UK, with the mattress arriving flat rather than rolled and boxed.
Key Features & what's inside
- Soft Knitted Cover. A highly breathable knitted cover that's soft to the touch. It gives the mattress a genuinely luxurious finish.
- Pillow Top / Comfort Layer. A soft polyester comfort layer that adds gentle cushioning, which means the surface feels welcoming rather than hard. It does this without compromising the firm feel underneath.
- Staycool™ Gel. A deep layer of Staycool Gel that provides a consistently cooling sensation, helping to regulate your temperature. If you're a hot sleeper, this is the layer doing the work for you.
- ActivFlex™ Spring Foam. A layer of spring foam that behaves like pocket springs for precise support, yet moulds to your body like foam. The result is support at every point of contact rather than pressure in a few places.
- Pocket Springs Core. A core of up to 1600 barrel-shaped pocket springs delivering targeted support to key areas of your body. This is where the firm feel comes from.
Layer details from mattressnextday.co.uk product page, September 2026.
Who's it NOT for?
This is a firm mattress, so lightweight side sleepers may find it presses on shoulders and hips rather than letting them settle in. If you love a deep, sink-in memory foam feel, the spring core here will feel firmer than you expect. And if you need a stated in-home trial, this listing doesn't mention one.
Sleepeezee ActivFlex Response 1600 Memory Mattress
View all mattresses
Is the Sleepeezee ActivFlex Response 1600 firm or soft?
It's rated firm. A polyester pillow top adds gentle surface cushioning, but the pocket spring core and ActivFlex spring foam deliver a supportive, firm feel overall. It suits back and front sleepers and heavier builds better than lightweight side sleepers.
Does the Sleepeezee ActivFlex Response 1600 sleep cool?
It's designed to. A deep layer of Staycool Gel sits beneath the comfort layer to regulate your temperature and prevent overheating, and the knitted cover is highly breathable. That makes it a better bet for hot sleepers than many traditional memory foam mattresses.
How deep is the Sleepeezee ActivFlex Response 1600?
It's 25cm deep, a fairly standard depth that most fitted sheets will accommodate without any trouble.
Does the Sleepeezee ActivFlex Response 1600 come with a guarantee?
The MattressNextDay listing states a Sleepeezee 10-year guarantee. Check the terms with your retailer at the point of purchase, as guarantee handling can vary depending on where you buy.
Is the Sleepeezee ActivFlex Response 1600 delivered rolled up?
No. When bought through MattressNextDay it arrives flat, not rolled and boxed, with free next day delivery to mainland UK, although some addresses may incur a small fee. That's the retailer's own service, so delivery terms may differ elsewhere.
Couldn't find an answer to your question? Send us a message