Firmness
Firm
Type
Hybrid
Depth (cm)
21
Number of Layers
4
Trial Period (nights)
Warranty (years)
20
Price Range
£239 to £339
Best Sleeping Position(s)
Certifications
Assessed from the specification published by Furniture Village, captured September 2026, and from regular price comparison across our UK retail partners.
Genuinely extra firm mattresses are surprisingly hard to find, and this one is honest about what it is. The e-Fibre fillings are breathable, which means heat can move away from you rather than building up, a real help if you sleep warm. The fillings are also hypoallergenic and contain no animal-derived materials, so it's a sound pick for allergy sufferers and vegans alike. Jay-Be's zero-to-landfill policy adds some reassurance about where it's made and how. At £239 to £339 depending on size, it's a simple construction, but you're paying for a specific job done properly: firm, breathable support without unnecessary padding.
Key Features & what's inside
- Advance e-Fibre. A breathable filling layer at the top of the mattress. It lets air move through the surface, which means less heat building up around you overnight.
- Rebound e-Fibre. A second breathable filling layer beneath the surface. It sits between you and the springs, adding a little resilience without softening the extra firm feel.
- High Density e-Fibre. A denser breathable filling layer above the spring core. This is where much of the firmness comes from, giving the surface its solid, supportive character.
- Open coil spring core. A sprung core providing reliable support across the mattress, with 325 springs in the king size. Open coil systems move as one unit, which means a firmer, more traditional feel than pocket springs.
Layer details from furniturevillage.co.uk product page, September 2026.
Who's it NOT for?
Side sleepers, particularly lightweight ones, will likely find this too hard on the shoulder and hip. If you like a plush, cushioned surface or the contouring feel of memory foam, look elsewhere. Couples sensitive to partner movement should also note that open coil cores transfer more motion than pocket springs.
Jay-Be Flex Ultra Firm Mattress
View all mattresses
How firm is the Jay-Be Flex Ultra Firm mattress?
The Furniture Village listing rates it as extra firm, a step up from a standard firm mattress. Expect a hard, supportive surface with very little sink, best suited to back and front sleepers or anyone who prefers sleeping on top of a mattress rather than in it.
How many springs does the Jay-Be Flex Ultra Firm have?
The open coil core contains 325 springs in the king size. Counts for other sizes aren't listed, though smaller sizes of open coil mattresses typically use the same spring unit scaled down.
Is the Jay-Be Flex Ultra Firm mattress good for allergy sufferers?
Yes. The e-Fibre fillings are hypoallergenic and the mattress is free from animal-derived materials, which also makes it suitable for vegans. It's made in Jay-Be's Yorkshire factory powered by 100% certified renewable electricity, with a zero-to-landfill policy.
Does the Jay-Be Flex Ultra Firm come with a guarantee?
Furniture Village lists a 20-year structural guarantee with this mattress. That's the retailer's own offer, so if you buy elsewhere, check what guarantee that retailer provides before ordering.
What sizes does the Jay-Be Flex Ultra Firm come in?
It's available in UK Single, Small Double, Double and King, priced from £239 to £339. All sizes are 21cm deep, slightly slimmer than many hybrids, so check your fitted sheets will still fit snugly.
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