Hypnos Orthos Support 6 Firm King Size Mattress
The Hypnos Orthos Support 6 is a firm pocket spring mattress, built around Hypnos's ReActive 6-turn pocket springs topped with layers of cotton.
- Firm support for heavier sleepers
- Minimises partner disturbance
- Four cotton layers wick moisture
£1,104.15
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Hypnos Orthos Support 6 Firm Mattress
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Mattress details
Mattress
Hypnos Orthos Support 6 Firm Mattress
Size
Firmness
Firm
Construction
Pocket Spring
Depth (cm)
Layers
2
Layer Details
Cotton comfort layers
Four layers of cotton sit at the top of the mattress. Cotton is breathable and wicks moisture, which means a cooler, drier feel through the night than synthetic fillings tend to give.
ReActive 6-turn pocket springs
The support core uses Hypnos's ReActive 6-turn pocket springs, each one working independently. That means the mattress contours to your body and limits motion transfer across the bed.
Layer details from mattressman.co.uk product page, September 2026.
Key benefits
- 75cm each for two sharers: Each of you gets 75cm of width, which means space to settle into your own position on a firm surface that rewards lying flat.
- Less disturbance on different schedules: The ReActive 6-turn pocket springs move independently, so if one of you gets up hours before the other, the movement stays on their side of the 150cm width.
- 200cm of length for taller sleepers: At 5ft x 6ft 6in, this size gives anyone approaching six foot room to lie fully stretched, which suits the back and front sleeping this firm build favours.
- Cooler across a bigger surface: Four cotton layers wick moisture and breathe well, and with more mattress per person, warm sleepers share less body heat through the night.
- Fits most main bedrooms: We suggest a room of at least 2.7m x 2.9m for a UK king, which most master bedrooms can manage without the squeeze a super king demands.
This size suits you if...
You share the bed every night and a double has started to feel cramped, especially with a firm mattress that works best when you can lie flat rather than curl inwards. It also suits you if one of you is on or near six foot and keeps finding feet at the end of the bed, or if you keep different hours and want movement on one side to stay there.
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. In either case we'd recommend the UK double instead, which is 15cm narrower and needs a smaller room, at least 2.6m x 2.8m.
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FAQ's
Is the Hypnos Orthos Support 6 in a UK king big enough for a couple?
Yes, comfortably for most. At 150cm wide it gives two sharers 75cm each, and because the pocket springs respond individually, a heavier partner settling on one side won't tilt the surface under the other. If you have found yourselves negotiating space on a double, the UK king is the step up that resolves it.
What room size do I need for a UK king Hypnos Orthos Support 6?
We suggest a room of at least 2.7m x 2.9m for a UK king, which leaves enough space to walk round the bed and open drawers. Measure with wardrobes in mind: a new build master bedroom can feel smaller than the floor plan suggests once storage goes in, so check the walking space rather than the wall-to-wall figure.
Is the UK king Orthos Support 6 long enough for someone over six foot?
At 200cm, the UK king is 10cm longer than the UK double, and on a firm mattress like this one that length is felt directly. Back and front sleepers lie flat rather than sinking in, so feet that hung over the end of a 190cm double get proper support here. For many taller buyers, the length is the real upgrade.
Should I choose the Orthos Support 6 in a king or a super king?
The UK king suits most couples: it adds meaningful space over a double without demanding a huge room. The UK super king is 30cm wider, the same length, and we suggest at least 3m x 2.9m for it. If a dog routinely claims part of your bed, or you both spread out, that extra width may justify the bigger room.
Does a firm mattress reduce partner disturbance in a king size?
The firmness itself isn't what helps; the pocket springs are. Each ReActive 6-turn spring compresses independently, so movement doesn't travel across the bed as it would on an open coil. Combine that with 75cm of width each and one of you can get up early without dragging the other awake. Compare the retailers listed on this page for current king size prices.