Firmness
Type
Hybrid
Depth (cm)
35
Number of Layers
5
Trial Period (nights)
Warranty (years)
10
Price Range
£639 to £1,059
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 suits sleepers who want orthopaedic-leaning support without a hard, unyielding surface. The medium firm tension and dual-layer spring construction keep your spine well supported, while the plush pillow top softens the first thing you feel when you lie down. The Staycool™ gel is profiled, meaning it's shaped to contour to your body as it moves heat away, so you get pressure relief and temperature regulation from the same layer. It comes from Sleepeezee, a UK manufacturer approved by the National Bed Federation, with a 10-year guarantee for reassurance. The price stretches to £1,059 in larger sizes, but the 35cm depth and 4,000-spring construction help justify that.
Key Features & what's inside
- Pillow Top. A plush pillow-top layer stitched into the mattress, acting like a built-in topper. It gives that hotel-style softness the moment you lie down.
- Profiled Staycool™ Gel. Multiple layers of profiled Staycool™ gel gently contour to your body while dispersing excess heat. In practice, that means cushioning at pressure points without the warmth build-up some foams cause.
- Soft Polyester Layers. Soft polyester layers sit beneath the gel, adding comfort without compromising support. They help the transition from the softer top into the firmer core feel gradual rather than abrupt.
- High Density Polyester. A high-density polyester layer maintains the mattress's structure and durability. This is what helps the mattress hold its shape over years of use.
- 4000 Pocket Spring System. A dual-layer orthopaedic construction combining 1,000 traditional pocket springs with 3,000 mini comfort springs, 4,000 in total. The traditional springs handle deep support while the mini springs fine-tune how the surface responds to your body.
Layer details from mattressnextday.co.uk product page, September 2026.
Who's it NOT for?
If you prefer a soft, sink-in feel, the medium firm tension here will likely feel too supportive. The 35cm depth also means standard fitted sheets may struggle, so budget for deep-pocket bedding. And if a lengthy home trial matters to you, the listing we reviewed doesn't state one, so check terms before you buy.
Sleepeezee Gel 4000 Pocket Hybrid Ortho Mattress
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Is the Sleepeezee Gel 4000 mattress firm or soft?
It's rated medium firm. The dual-layer spring system gives orthopaedic-style support, but the stitched-in pillow top and Staycool™ gel layers soften the surface feel, so it's supportive rather than hard. Lightweight side sleepers who like a plush feel may still find it slightly too firm.
How many springs does the Sleepeezee Gel 4000 have?
It has 4,000 springs in total: 1,000 traditional pocket springs combined with 3,000 mini comfort springs in a dual-layer orthopaedic construction. The traditional springs provide the core support while the mini springs add a responsive comfort layer nearer the surface.
Does the Sleepeezee Gel 4000 come with a guarantee?
Yes, Sleepeezee provides a 10-year manufacturer guarantee. That's separate from any delivery or returns terms offered by the retailer you buy from, so it applies regardless of where you purchase.
Is the Sleepeezee Gel 4000 good for hot sleepers?
It's designed with hot sleepers in mind. The profiled Staycool™ gel layers contour to your body while dispersing excess heat, and the sprung core allows more airflow than an all-foam mattress. If overheating regularly wakes you, this construction should help.
How deep is the Sleepeezee Gel 4000 mattress?
It's 35cm deep, which is deeper than many mattresses. You'll want deep-pocket fitted sheets, and if you have a low bed frame the extra height is worth measuring for before you order.
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