Firmness
Medium
Type
Pocket Spring
Depth (cm)
26
Number of Layers
4
Trial Period (nights)
60
Warranty (years)
5
Price Range
£674 to £675
Best Sleeping Position(s)
Certifications
Assessed from Silentnight's published specification for this mattress, captured September 2026, and from regular price comparison across our UK retail partners.
The main draw here is the plant based construction. Silentnight states the mattress is foam free, with fibres farmed with minimal use of pesticides or fertilisers, which means you get cushioning from bamboo, kapok, flax and aloe vera rather than petrochemical foams. Sleepers who run warm should also take note: the Tencel Lyocell sleep surface is woven for airflow and moisture transport, and Silentnight describes the Platinum comfort layer as ten times more breathable than memory foam with the same pressure relief. Underneath, 1200 Mirapocket springs provide spinal support, and the medium firmness suits most sleepers, although lightweight side sleepers may find it slightly firmer than expected. A 60-night trial gives you time to be sure.
Key Features & what's inside
- 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.
Who's it NOT for?
If you sleep in anything other than a UK Double, this mattress is currently unavailable in your size, which is a significant limitation. It is also a medium feel, so if you specifically want a firm mattress for back support, or a soft, sink-in surface, you would be better served elsewhere.
Silentnight Plant Based 1200 Mattress
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Is the Silentnight Plant Based 1200 mattress foam free?
Yes, according to Silentnight's own product page the mattress is foam free and uses natural flame retardants. The comfort layers are made from plant based fibres including bamboo, kapok, flax and aloe vera, farmed with minimal use of pesticides or fertilisers.
How firm is the Silentnight Plant Based 1200?
Silentnight rates it as medium. That suits most back and combination sleepers, although lightweight side sleepers may find it a little firm, and anyone wanting a properly firm feel should look at other options.
Does the Silentnight Plant Based 1200 come with a trial?
Yes. Silentnight offers a 60-night trial, so you can sleep on it at home before committing. It also carries a 5-year guarantee, and delivery is listed at 14 days.
How many springs does the Silentnight Plant Based 1200 have?
It contains 1200 Mirapocket springs. These are individually pocketed, which means each spring moves independently to follow the shape of your body, supporting your spine and reducing motion transfer from a partner.
Is the Silentnight Plant Based 1200 good for hot sleepers?
It should be. The Tencel Lyocell sleep surface is woven for airflow and moisture transport, and Silentnight states the Platinum comfort layer is ten times more breathable than memory foam. There are no traditional foams to trap heat.
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