Otty Natural Evolve King Size Mattress
The Otty Natural Evolve is a double-sided, medium-firm mattress built around natural materials: wool, silk, cashmere and cotton, with up to 4,500 pocket springs in total.
- Wool, silk & cashmere regulate heat
- Micro springs ease pressure points
- 100-night trial & 10-year guarantee
£999.99
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Otty Natural Evolve Mattress
More available sizes
Mattress details
Mattress
Otty Natural Evolve Mattress
Size
Firmness
Medium Firm
Construction
Pocket Spring
Wool
Natural
Depth (cm)
28
Layers
7
Layer Details
Hand-Stitched Tufted Cover
Handmade in the UK from thick viscose, with handles on the sides. That means rotating and flipping this heavy, double-sided mattress is far less of a struggle.
Luxurious Wool, Silk & Cashmere
A blend of wool, silk and cashmere sits just beneath the cover. These fibres breathe and regulate temperature naturally, so the sleep surface feels soft without trapping heat.
Natural Rebound Cotton
A layer of naturally breathable cotton that wicks moisture away. This helps keep the mattress cool and dry over time.
1750 Micro Pocket Springs
Smaller, high-density springs that respond to finer pressure points than a standard spring unit can. You'll feel this as gentler cushioning at shoulders and hips, with less partner disturbance.
Natural Rebound Cotton
A second cotton layer, again breathable and moisture-wicking. It keeps airflow moving between the two spring systems.
Core Pocket Spring Unit
Individually wrapped springs that adapt to your body shape, which means proper spinal alignment and reduced pressure points. This is the mattress's main support engine.
All The Layers Again - Reversed
The whole construction is mirrored on the other side, making the mattress fully flippable. Flipping spreads wear evenly and extends the mattress's lifespan.
Layer details from otty.com product page, September 2026.
Key benefits
- 75cm of width each: Two people sharing get 75cm each, which means you can turn over without negotiating for space or waking whoever is next to you.
- Micro springs reduce partner disturbance: The 1,750 micro pocket springs absorb small movements near the surface, so a partner leaving for an early shift is less likely to drag you awake with them.
- 200cm of length for taller sleepers: At 6ft 6in long, this size stops anyone approaching six foot pressing their feet against the footboard, something the mattress itself cannot fix at shorter lengths.
- Natural fibres across a wider surface: Wool, silk and cashmere regulate temperature naturally, and in a king there is enough surface area that two warm bodies are not sharing one small pocket of heat.
- Flippable, with handles that matter at this size: A double-sided 28cm mattress is heavy in a king, so the side handles are a practical necessity here rather than a nice extra.
This size suits you if...
You share the bed every night and a double has started to feel cramped, especially if one of you keeps different hours and the other feels every exit and entrance. It also fits if either partner is tall and needs the 200cm length, or if a dog has quietly become a permanent third occupant and 135cm no longer stretches to everyone.
Consider another size if...
Your bedroom is smaller than the 2.7m x 2.9m we suggest as a minimum for this size, or you sleep alone. The UK double would suit a tighter room better, and a solo sleeper rarely needs 150cm of width.
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FAQ's
How much space do two people get on a king size Otty Natural Evolve?
Two people sharing get 75cm of width each. Combined with the 1,750 micro pocket springs near the surface, which soften movement before it travels across the bed, that spacing means most couples can shift position or get up without disturbing each other.
Is the Otty Natural Evolve UK king worth it over the double?
The UK king is 15cm wider than the UK double and adds 10cm of length, taking it to 200cm. The width is the difference most couples feel nightly, while the length is the deciding factor if either of you is approaching six foot. If your room can take it, the upgrade is usually the right call.
What room size does the Otty Natural Evolve king need?
We suggest a room of at least 2.7m x 2.9m, with around 3.2m x 3.2m feeling comfortable. Measure with wardrobes and drawers in place, as a new build master bedroom can shrink quickly once furniture goes in. If you cannot walk both sides of the bed, consider the UK double instead.
Is the king size Otty Natural Evolve hard to flip?
It takes some effort. This is a 28cm, double-sided mattress spanning 150 x 200cm, so it is a two-person job in this size. The handles stitched into the sides make gripping it much easier, and flipping spreads wear across both faces, which helps the mattress hold its shape for longer.
Will the Otty Natural Evolve king help if my partner gets up earlier than me?
It should. The micro pocket springs respond to pressure individually, so movement on one side transfers weakly to the other, and the 75cm of width each puts real distance between you. No mattress makes an alarm silent, but this combination limits how much of the getting-up you physically feel.