Firmness
Type
Pocket Spring
Depth (cm)
25
Number of Layers
5
Trial Period (nights)
60
Warranty (years)
5
Price Range
£269 to £519
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.
If you're a hot sleeper on a budget, this is the sort of mattress designed with you in mind. The Comfort Breathe fibres are there to promote airflow and regulate temperature, and the sleep surface uses naturally hypoallergenic fabric, gentle on skin and a sensible pick if allergies bother you. The 800 Mirapocket springs give zoned support aimed at keeping your spine aligned, which you'll feel as a settled, even surface rather than a bouncy one. The medium firmness suits most sleepers, although anyone who prefers a very firm or very soft feel should look elsewhere. It's a simpler build than premium models, but at this price that's a fair trade.
Key Features & what's inside
- Sleep surface. A naturally hypoallergenic fabric that's soft and gentle on the skin. A reassuring choice if you're sensitive to allergens.
- Comfort Breathe®. Silentnight describes these fibres as 15x more breathable than standard memory foam, promoting airflow and regulating temperature. In practice, that means a cooler surface for hot sleepers.
- 800 Mirapocket spring unit. 800 individual pocket springs respond separately to your body's movements, which means zoned support and better spinal alignment. You shouldn't roll towards a partner every time they turn over.
- Protective Layer. This layer disperses pressure from the spring unit across the mattress. It's there to help the mattress last longer.
- Durable case. A soft, hard-wearing case designed to keep the mattress comfortable for years to come.
Layer details from silentnight.co.uk product page, September 2026.
Who's it NOT for?
This is a medium-feel mattress, so if you sleep better on something very firm, perhaps for back pain, or you love a soft, sink-in surface, it's unlikely to suit. Heavier sleepers who want deep foam contouring may also find the fibre-and-spring build a little simple for their needs.
Silentnight Comfort Breathe 800 Mattress
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Is the Silentnight Comfort Breathe 800 good for hot sleepers?
Yes, that's its main selling point. The Comfort Breathe fibre layer is described by Silentnight as 15x more breathable than standard memory foam, promoting airflow and regulating temperature through the night.
How firm is the Silentnight Comfort Breathe 800?
Silentnight rates it as medium. That suits most back and side sleepers, although anyone who prefers a distinctly firm or soft feel should consider other options.
Does the Silentnight Comfort Breathe 800 come with a trial?
Yes. Silentnight offers a 60-night trial, so you can sleep on it at home before committing. It also comes with a 5-year guarantee.
How deep is the Silentnight Comfort Breathe 800?
It's 25cm deep, so most standard fitted sheets should fit without any trouble.
What sizes does the Silentnight Comfort Breathe 800 come in?
Five sizes: UK Single, Small Double, Double, King and Super King, priced from £269 to £519 depending on the size you choose.
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