Silentnight UltraGel 3000 Mirapocket Box Top Firmer Single Mattress
The Silentnight UltraGel 3000 Mirapocket Box Top Firmer is a firm hybrid with a softer story on top.
- Firm feel with a cushioned top
- Extra support under your hips
- Minimises partner disturbance
£715
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Silentnight UltraGel 3000 Mirapocket Box Top Firmer Mattress
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Mattress details
Mattress
Silentnight UltraGel 3000 Mirapocket Box Top Firmer Mattress
Size
Firmness
Firm
Construction
Foam
Pocket Spring
Hybrid
Gel
Depth (cm)
35
Layers
4
Layer Details
Pillow top
An additional comfort layer sewn on top, which means a more luxurious, cushioned feel the moment you lie down. It softens the first impression of what is otherwise a firm mattress.
UltraGel
A gel infused foam layer that adapts to your shape and movements, distributing your weight evenly. According to the listing it's five times more breathable than memory foam, so it should hold less heat.
Mini Pocket Springs
A layer of 1,000 mini pocket springs that work like bellows, pushing air through the comfort layers as you move. They also help decrease motion transfer, so you feel less of a restless partner.
Mirapocket Springs
The main support unit of 2,000 Mirapocket springs, zoned so the centre third is firmer. That means greater support under your midsection and encouragement towards better spinal alignment.
Layer details from mattressonline.co.uk product page, September 2026.
Key benefits
- Fits a crowded room: At 90cm wide, the UK single leaves space for a desk, a wardrobe and toy storage in a child's bedroom, and we suggest a room of at least 2.1m x 2.8m.
- Firm support for one: The Mirapocket springs are firmer through the centre third, which means one sleeper's hips get the extra support without a partner's weight changing how the mattress feels.
- Cushioned first impression: The pillow top and UltraGel foam soften the surface a little, so a guest who is new to firm mattresses is less likely to find it hard.
- Easier to handle than larger sizes: Owners find this 35cm mattress awkward to turn alone, but the UK single's smaller footprint makes rotating it more manageable than the UK king or UK super king.
- Plan for deep sheets: Standard single fitted sheets may struggle with the 35cm depth, so buy deep-fitted single sheets before the mattress arrives.
This size suits you if...
You sleep alone and want firm, zoned support with a softer top, or you're furnishing a teenager's room or small spare room where floor space matters more than width.
Consider another size if...
You share the bed most nights, or your child uses a bunk or mid sleeper with a strict depth limit. For couples, we'd recommend the UK double, with a room of at least 2.6m x 2.8m.
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FAQ's
Will the UltraGel 3000 UK single fit a bunk bed or mid sleeper?
It may not. This mattress is 35cm deep, and raised frames usually state a maximum mattress depth so the guard rail stays effective. Check your frame maker's guidance before buying. If the UltraGel 3000 exceeds the limit, choose a slimmer mattress for that bed.
Is a firm UK single mattress like the UltraGel 3000 right for a teenager?
It can be, if your teenager wants firm, supportive push-back with some cushioning on top. Verified owner reviews note that lightweight side sleepers may find the firm core a little unyielding even with the pillow top. For a slim teen who sleeps on their side, a softer mattress may be kinder.
What size bedroom do I need for a Silentnight UltraGel 3000 UK single?
We suggest at least 2.1m x 2.8m of floor space for a UK single. That leaves enough room to walk around the bed and open drawers. In a child's room, it also keeps space for a desk or wardrobe.
Does the UltraGel 3000 UK single really have 3,000 springs?
No. The 3,000 figure in the name is based on the kingsize. A UK single is a smaller mattress, so the 3,000 count doesn't describe it. The construction is the same, though: mini pocket springs sit above the zoned Mirapocket unit, with the pillow top and UltraGel foam on top.
Is the UltraGel 3000 UK single a good choice for a loft conversion?
The UK single's narrow footprint fits neatly under a sloping ceiling. At 35cm deep, though, it raises the sleeping surface more than a slimmer mattress would. Measure the headroom above your frame so whoever sleeps there can sit up without hitting the slope.