TheraPur ActiGel Glacier 4000 Combination Double Mattress
The TheraPur ActiGel Glacier 4000 Combination Mattress pairs a graphite-infused cooling cover with zoned ActiGel foam and pocket springs, which means you get pressure relief with less trapped heat.
- Graphite-infused cover keeps you cooler
- Zoned foam eases pressure
- Springs absorb motion
£1,439
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TheraPur ActiGel Glacier 4000 Combination Mattress
More available sizes
Mattress details
Mattress
TheraPur ActiGel Glacier 4000 Combination Mattress
Size
Firmness
Medium
Construction
Foam
Gel
Pocket Spring
Depth (cm)
28
Layers
3
Layer Details
ActiCool+ cover
A graphite-infused cover that TheraPur describes as its coolest ever. It's the surface you lie on, so it's there to keep you feeling cooler through the night.
ActiGel foam
4cm of zoned ActiGel foam that relieves pressure without trapping heat. You get cushioning where your body needs it, without the warmth that foam can hold.
Pocket and micro springs
Responsive pocket and micro springs that absorb motion. They give the mattress its support and should limit how much you feel a partner moving.
Layer details from dreams.ie product page, November 2026.
Key benefits
- Sits well in a typical bedroom: At 4ft 6in x 6ft 3in, it fits a room of at least 2.6m x 2.8m, our suggested minimum, with around 3m x 3m feeling relaxed.
- Cooler when two of you share: Two people side by side build up heat, so the graphite-infused cover and ActiGel foam suit couples where one or both tend to wake up warm.
- Less disturbance from a partner: The pocket and micro springs absorb motion, which means you should feel a little less of your partner turning over when you're lying fairly close together.
- Space left for bedside tables: It's 15cm narrower and 10cm shorter than the UK king, which can decide whether bedside tables fit on both sides or you squeeze past one.
- Bedding is easy to find: Double sheets and a 200 x 200cm double duvet fit, so you won't need to hunt down specialist sizes when you're kitting out the room.
This size suits you if...
You share the bed with a partner and your bedroom is around 3m x 3m or a touch smaller, or you're setting up a guest room where visiting couples need a proper shared bed with a medium feel that suits most sleeping positions.
Consider another size if...
Either of you sleeps spread out, or you both run hot and want more distance between you. We'd recommend the UK king instead, which gives 75cm each. Allow at least 2.7m x 2.9m for it.
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FAQ's
Is the TheraPur ActiGel Glacier 4000 UK double big enough for two people?
It gives 67.5cm each, which most couples find workable if neither of you sleeps starfished. Yes, the UK double is snug, but the motion-absorbing pocket and micro springs should soften the effect of a restless partner. If you want more distance, the UK king adds 7.5cm each.
What size room do I need for a UK double Glacier 4000?
We suggest at least 2.6m x 2.8m, with around 3m x 3m being comfortable once a wardrobe and drawers are in. In a smaller second bedroom, check where doors and drawers open before you commit, because a 135cm-wide bed eats into walkway space faster than you'd expect.
Should I get the ActiGel Glacier 4000 in a UK double or UK king?
The UK king is 15cm wider and 10cm longer, giving 75cm each against 67.5cm. If your room clears 2.7m x 2.9m, which we suggest for the UK king, and you both like space, size up. If bedside tables on both sides would become a squeeze, stay with the UK double.
Will the Glacier 4000 UK double fit up a narrow staircase?
A mattress 135cm wide and 28cm deep is awkward to carry round a turning staircase in an older terrace or across a cramped new build landing. Measure the narrowest point and any low ceiling on the stairs first, then compare the retailers listed on this page.
Is a UK double Glacier 4000 a good choice for a guest room?
It suits a guest room if you mostly host couples, since 67.5cm each is fine for a few nights and the medium feel suits most sleeping positions. If your guests usually come alone, the UK small double is 15cm narrower and we suggest at least 2.4m x 2.8m for it.