Hypnos Alcester Ortho Extra Mattress
Mattress
Hypnos Alcester Ortho Extra Mattress
Size
Firmness
Firm
Construction
Depth (cm)
27
Layers
4
Layer Details
- Damask cover. A finely woven, durable fabric that feels soft to the touch. It doesn't retain heat, which means it stays cooler against you through the night.
- Cotton. Breathable cotton fibres that wick away moisture. In practice that keeps you dry and cool rather than clammy.
- Solotex™. A filling engineered from recycled plastic, so it's an eco-friendlier choice. It's extremely durable and cuddles body contours for a slightly softer feel over the firm springs.
- Pocket Springs. 1,200 ReActivePro 6-turn pocket springs with tighter spring resistance. That means a more supportive surface that still adapts to your unique shape, weight and movement.
Layer details from mattressonline.co.uk product page, September 2026.
- Firm support with space to move: The 1,200 ReActivePro 6-turn pocket springs keep the whole 120cm width evenly supportive, so you can shift position at night without finding a soft edge.
- Room for one to stretch: At 30cm wider than the UK single, this size suits a back or front sleeper who has outgrown a single but doesn't need a full double.
- Fits where a double won't: It's 15cm narrower than the UK double, which can be the difference between a door that clears the bed frame and one that doesn't.
- Cool across a compact room: The damask cover and breathable cotton fillings resist heat build-up, useful in smaller rooms where warm air has nowhere to go.
- Flippable for a spare room: Because it can be rotated and flipped, it wears evenly even with the irregular use a guest bedroom gets.
This size suits you if...
You're a solo adult who sleeps on your back or front, prefers a firm feel, and wants more width than a UK single without giving up floor space, or you're furnishing a box room, loft conversion or guest bedroom where a 4ft frame fits and a 4ft 6in one wouldn't. It also suits a spare room where couples stay occasionally rather than every night.
Consider another size if...
You share the bed every night, because 120cm gets tight for two adults on a firm mattress with little sink-in. We'd recommend the UK double instead, which is 15cm wider; allow a room of at least 2.6m x 2.8m.
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Is a small double big enough for a firm mattress like the Hypnos Alcester Ortho Extra?
For one adult, comfortably. The firm pocket spring surface stays consistent across the full 120 x 190cm, so a solo sleeper has real room to change position. For two people sharing nightly it's a squeeze, since a firm feel means you lie on the surface rather than sinking in, and personal space matters more.
Can a couple share the Hypnos Alcester Ortho Extra in a small double?
For occasional nights, yes, which makes this size a sensible guest room choice. The tighter spring resistance limits motion transfer between you, so one person turning over is less disruptive. Every night is a different matter: at 120cm wide most couples will want the UK double, which is 15cm wider.
What room size do I need for a small double Hypnos Alcester Ortho Extra?
We suggest at least 2.4m x 2.8m, which is our guidance rather than the manufacturer's. That leaves walking room on at least one side and space for a wardrobe door to open. In a loft conversion, check where the ceiling height sits over the bed's position before committing to any size.
Is the small double a good size for a teenager?
Often, yes. It's 30cm wider than the UK single at the same length, so a teenager who has outgrown a single gains genuine width without losing much floor space. The firm feel suits growing back and front sleepers, though a lightweight side sleeper may find this mattress presses on shoulders and hips.
Should I choose the small double or size up to the UK double?
It usually comes down to the room. The UK small double fits spaces where we'd suggest at least 2.4m x 2.8m; the UK double needs at least 2.6m x 2.8m. If you sleep alone, the small double is ample. If a partner stays most nights, the extra 15cm of the UK double is money well spent.