Jay Be Pure Anti-Allergy Sprung Mattress
Mattress
Jay Be Pure Anti-Allergy Sprung Mattress
Size
Firmness
Construction
Depth (cm)
21
Layers
4
Layer Details
- Sleep surface. A soft-knitted sleep surface treated with plant-based margosa and linseed oils, which is where the anti-allergy protection comes from. It sits directly against your bedding, so the treatment works where it matters.
- Comfort layer. Extra-soft Advance e-Fibre, deep-quilted for gentle cushioning. This gives the initial softness you feel when you first lie down.
- Comfort layers. Breathable, 100% foam-free open-structured comfort layers that allow air to circulate freely. If you tend to sleep hot, this is the layer doing the work to keep you cooler.
- Support core. A deep sprung core that distributes support evenly across the mattress. This is what keeps your spine aligned rather than letting you sink into a dip.
Layer details from jaybe.com product page, September 2026.
- Real room for one: At 120cm wide you can shift position, starfish or share with a book, which a UK single simply doesn't allow.
- Fits where a double won't: It's 15cm narrower than a UK double, which can be the difference between a bed and a squeeze in a box room or studio.
- Cooler solo sleeping: The foam-free Advance e-Fibre layers let air move through the mattress, useful in smaller rooms that warm up quickly.
- Sensible for guests: A small double comfortably hosts one visitor and manages a couple for the odd night, which suits a spare room nobody uses nightly.
- Easy to dress: 4ft is a standard UK size, so small double fitted sheets and frames are simple to find on the high street.
This size suits you if...
You sleep alone and have outgrown a UK single, perhaps a teenager whose room can't spare more floor space, or you're furnishing a compact bedroom, loft conversion or guest room where a full double would leave no walking room. Allergies or overheating are on your mind too, since the plant-based anti-allergy treatment and breathable layers carry through to this size unchanged.
Consider another size if...
You share the bed every night, or your room comfortably takes a wider bed. Couples on a small double get less width each than most find comfortable long term, so we'd recommend the UK double instead; allow at least 2.6m x 2.8m for it.
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Will a small double Jay Be Pure fit in a box room?
Often, yes, and that's this size's main appeal. We suggest allowing at least 2.4m x 2.8m of floor space so you can still open the door and walk around the bed. Measure with wardrobes and radiators in mind, since it's usually width, that 120cm, that decides whether the room works.
Is a small double big enough for one adult to spread out?
Yes. At 120cm wide it gives a solo sleeper 30cm more width than a UK single, which is enough to change position freely rather than sleeping in one lane. The 190cm length is the same as a single and a double, so anyone comfortable in those lengths will be fine here.
Is the small double a good choice for a guest room?
It's one of the better sizes for occasional guests. One visitor gets generous space, and a couple can share for a night or two without the bed dominating a small spare room. If guests are regularly couples staying for longer, the UK double is 15cm wider and worth considering, with at least 2.6m x 2.8m of room.
How much smaller is the small double than the UK king in this mattress?
The UK small double is 30cm narrower and 10cm shorter than the UK king. That's a substantial jump: the UK king needs a room of at least 2.7m x 2.9m by our guidance, against 2.4m x 2.8m for the UK small double. Taller sleepers should note the 10cm length difference too.
Does the anti-allergy treatment differ by size?
No, and that's worth knowing before you pay for a bigger bed hoping for more of it. The plant-based margosa and linseed oil treatment on the sleep surface, the foam-free e-Fibre layers and the sprung core are identical across sizes, so choose on space and room fit alone.