Silentnight UltraGel 3000 Mirapocket Box Top Firmer Mattress
Mattress
Silentnight UltraGel 3000 Mirapocket Box Top Firmer Mattress
Size
Firmness
Firm
Construction
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.
- Sized for the rooms most couples have: At 135 x 190cm it leaves floor space for a wardrobe and drawers in the kind of bedroom where a UK king would crowd everything else out.
- A firm middle where couples meet: The Mirapocket springs are firmer through the centre third, which means the hips of both sleepers stay better supported on a mattress where you lie fairly close together.
- Less disturbance at close quarters: The layer of 1,000 mini pocket springs helps cut motion transfer, useful on a UK double where a partner turning over is never far away.
- Room for bedside tables in a typical room: Allow at least 2.6m x 2.8m, and closer to 3m x 3m if you want a bedside table and a clear path on both sides.
- Easy bedding to find: Standard UK double bedding and a 200 x 200cm duvet fit, although you will need deep fitted sheets to cover the 35cm depth.
This size suits you if...
You share the bed with a partner and want firm support without a hard surface, your bedroom is a typical UK size of around 2.6m x 2.8m or more, and you would rather keep space for bedside tables than squeeze in a bigger bed.
Consider another size if...
One of you sprawls, or 67.5cm each already feels cramped. We'd recommend the UK king instead, which gives 75cm each; we suggest at least 2.7m x 2.9m for it.
Similar Mattresses in This Price Range
Did you know? On Mattress Unboxed we have over 1,000 different mattresses to suit all types of sleepers. View all mattresses.
Is the Silentnight UltraGel 3000 UK double big enough for two people?
For most couples, yes. The UK double gives 67.5cm each, which suits partners who sleep fairly still or like to be close. If either of you spreads out, the UK king gives 75cm each, so the UK double gives 7.5cm less per person. The firmer centre zone does help keep you from drifting into each other.
What size is the UltraGel 3000 double in feet?
The UK double measures 4ft 6in x 6ft 3in, or 135 x 190cm. That length suits most adults, but if either of you is tall and your feet reach the end, the UK king is 10cm longer as well as 15cm wider.
How many springs are in the UltraGel 3000 UK double?
Silentnight quotes the 3,000 spring count based on the kingsize, split into 2,000 Mirapocket springs and 1,000 mini pocket springs. The brand doesn't publish a separate spring count for the UK double, so check with the retailer if the exact figure for this size matters to you.
Will an UltraGel 3000 UK double fit in my bedroom with bedside tables?
We suggest a room of at least 2.6m x 2.8m for a UK double. If you want a bedside table on each side and space to walk round the bed, around 3m x 3m is more comfortable. Measure your room first, remembering the wardrobe and drawers need space too.
What fitted sheets fit the UltraGel 3000 in a UK double?
Buy UK double fitted sheets for a 135 x 190cm mattress, choosing a deep pocket style because this mattress is 35cm deep. Standard shallow sheets tend to ping off the corners. A 200 x 200cm double duvet covers two people comfortably on a UK double.