Jay-Be Ryze Sprung Quilted e-pocket 800 King Size Mattress in a Box
The Jay-Be Ryze Sprung Quilted e-pocket 800 is a medium-firmness mattress in a box built around 800 individual pocket springs, which means the mattress adapts to your body's contours and limits how much you feel a partner moving.
- Ventilated build lets heat escape
- Minimises partner disturbance
- 10-year guarantee
£374.14
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Jay-Be Ryze Sprung Quilted e-pocket 800 Mattress in a Box
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Mattress details
Mattress
Jay-Be Ryze Sprung Quilted e-pocket 800 Mattress in a Box
Size
Firmness
Medium
Construction
Foam
Pocket Spring
Rolled
Eco-Friendly
Depth (cm)
23
Layers
4
Layer Details
Advance e-Fibre™
An extra-soft, deep-quilted top layer of Advance e-Fibre, which means a luxurious surface feel the moment you lie down. It also wicks moisture away to help keep the mattress fresh and regulate temperature.
Breathable comfort layers
Open-cell comfort layers let air circulate freely through the mattress. In practice that means a fresher, more ambient sleep environment rather than trapped heat.
3D Mesh ventilated border
The border itself is made from ventilated 3D mesh, which gives warm air an escape route around the sides. It's a small detail that adds to the mattress's overall breathability.
Deep Pocket Sprung core
800 individual pocket springs adapt to your body's contours for tailored support. Because each spring moves independently, motion transfer is reduced, so you're less likely to be disturbed by a restless partner.
Layer details from jaybe.com product page, September 2026.
Key benefits
- 75cm each when sharing: Two of you get 75cm each, so one person shifting for comfort no longer means the other giving up ground.
- Pocket springs plus space equals fewer wake-ups: The 800 individual springs already limit motion transfer, and the wider UK king puts extra distance between you, which helps if one of you gets up hours earlier.
- 200cm of length for taller sleepers: The UK king adds 10cm of length over the UK double, so anyone approaching six foot stops sleeping with their feet at the edge.
- Foam-free breathability across a bigger surface: The open-cell layers and ventilated mesh border let heat escape, and with more mattress each, two warm sleepers share less body heat too.
- Easier to place than you'd think: We suggest a room of at least 2.7m x 2.9m for a UK king, which many master bedrooms can manage with bedside tables on both sides.
This size suits you if...
You share the bed every night and a double has started to feel like a compromise, one of you is up and out hours before the other and you want the springs and the extra width working together to keep the peace, or one of you is around six foot and it's the 200cm length you're really buying.
Consider another size if...
Your bedroom falls short of the 2.7m x 2.9m we suggest for a UK king, or you sleep alone. We'd recommend the UK double instead, which needs at least 2.6m x 2.8m and still gives a solo sleeper plenty of room.
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FAQ's
Is the Jay-Be Ryze e-pocket 800 in a UK king good for couples?
Yes, and it's arguably the size this mattress makes most sense in. You get 75cm each for two people sharing, and because each of the 800 pocket springs moves independently, a partner turning over on their side of the bed transfers less movement to yours. The medium firmness suits most sharing couples, although lightweight side sleepers may find it slightly firm.
How much bigger is a UK king than a double for this mattress?
The UK king is 15cm wider than the UK double and 10cm longer, taking you from 135 x 190cm to 150 x 200cm. The width is what you notice night to night when sharing; the length is the difference for anyone tall. Firmness and construction are identical, so you're paying purely for space.
What room size do I need for the Jay-Be Ryze in a UK king?
We suggest at least 2.7m x 2.9m, with around 3.2m x 3.2m feeling comfortable once wardrobes and bedside tables go in. New build masters can be tighter than they look on the plans, so measure with the furniture in place. If the room won't stretch, the UK double needs at least 2.6m x 2.8m.
Is the UK king Jay-Be Ryze long enough for tall sleepers?
At 200cm, the UK king is 10cm longer than the UK single, small double and double, all of which are 190cm. For anyone around six foot, that extra length is often the real reason to size up, more so than width. Only the UK super king matches it, at the same 200cm length.
Will the king size Jay-Be Ryze sleep cool for two people?
It should. The build is entirely foam-free, with open-cell comfort layers and a ventilated 3D mesh border giving warm air routes out, and the Advance e-Fibre top layer wicks moisture away. Two people naturally generate more heat than one, but the UK king's extra width means you share less of it. Hot-sleeping couples are well served here.