Silentnight Plant Based 1200 Mattress
Mattress
Silentnight Plant Based 1200 Mattress
Size
Firmness
Medium
Construction
Depth (cm)
26
Layers
4
Layer Details
- Breathable Tencel™ Lyocell sleep surface. A silky, soft touch fabric woven to allow airflow and move moisture away from you as you sleep, which means the surface feels naturally cool rather than clammy. A helpful start if you tend to overheat at night.
- Platinum comfort layer. Silentnight describes this as ten times more breathable than memory foam while offering the same pressure relief. In practice that means a cocooning, cushioned feel without the heat build-up memory foam is known for.
- Plant Based Comfort Layer. A blend of bamboo, kapok, flax and aloe vera, sustainably sourced and designed using Silentnight's sleep research. This is where the mattress gets its natural credentials, replacing synthetic fillings with plant fibres.
- 1200 Mirapocket® springs. The 1200 individually pocketed Mirapocket springs respond to your body independently, which means better spinal alignment and less disturbance from a partner's movement.
Layer details from silentnight.co.uk product page, September 2026.
- A shared size that fits most rooms: At 135 x 190cm, the UK double leaves space for bedside tables on both sides in an average bedroom, where a UK king would start to dominate.
- 67.5cm each for couples: Two people sharing get 67.5cm of width apiece, enough for most couples who sleep reasonably close, though restless sleepers will notice the limit.
- Plant based layers in a familiar format: Bamboo, kapok, flax and aloe vera provide the cushioning, which means a more natural build without giving up the feel of a pocket sprung double.
- Cooler sharing: Two bodies raise the temperature under one duvet, so the airflow-woven Tencel Lyocell surface matters more in a shared UK double than it would solo.
- Easy to dress: Standard double sheets and a 200 x 200cm duvet fit, both stocked everywhere at every price point.
This size suits you if...
You share the bed every night and your room is a typical UK size, or you're furnishing a guest room that needs to sleep visiting couples comfortably. It also suits a solo sleeper who wants space to spread out, perhaps with a dog or cat claiming a corner. Allow at least 2.6m x 2.8m of floor space, with around 3m x 3m the comfortable norm.
Consider another size if...
You need any size other than a UK double, because Silentnight currently makes this mattress in this size only. Couples who want more than 67.5cm of width each will need to look at a different mattress in a UK king.
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Is a UK double Silentnight Plant Based 1200 big enough for a couple?
Yes, for most couples. The UK double is 135 x 190cm, giving 67.5cm each for two people sharing. That's the long standing UK standard for couples, though if either of you is tall, broad or a restless sleeper, you may feel the limit. The medium feel suits most sleepers, although lightweight side sleepers may find it slightly firmer than expected.
Does the Silentnight Plant Based 1200 come in a king size?
No. Silentnight currently offers this mattress in a UK double only, which is a significant limitation. If you're set on a king, you'll need a different mattress. If the plant based build is what drew you in, the UK double may be worth considering, provided 67.5cm of width each is enough for how you sleep.
What size room do I need for the Silentnight Plant Based 1200 in a UK double?
We suggest at least 2.6m x 2.8m of floor space, with around 3m x 3m the comfortable norm. That allows walking space around the bed and, in most layouts, bedside tables on both sides. If your room is smaller, a UK double can still fit, but expect to compromise on wardrobe placement or one side of the bed.
Will a UK double mattress fit up a narrow staircase?
Usually, yes. At 135 x 190cm the UK double is manageable on most stairs, and pocket sprung mattresses like this one flex a little on turns. Tight landings in new builds and winding stairs in older terraces are the usual pinch points, so measure the narrowest turn before ordering rather than assuming.
Where can I buy the Silentnight Plant Based 1200 in a UK double?
Compare the retailers listed on this page; the prices shown here are updated as retailers change them. Because Silentnight makes this mattress in the UK double only, you won't need to check size availability separately, just confirm the retailer's delivery arrangements suit your home before you order.