TheraPur ActiGel Polar 1000 Double Mattress
The TheraPur ActiGel Polar 1000 Mattress combines a knitted ActiCool cover with cooling ActiGel foam over pocket springs, which means a cooling surface and a medium feel underneath.
- Cooling cover & airflow foam
- Medium feel suits most sleepers
- Fully hypoallergenic finish
£599
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TheraPur ActiGel Polar 1000 Mattress
More available sizes
Mattress details
Mattress
TheraPur ActiGel Polar 1000 Mattress
Size
Firmness
Medium
Construction
Foam
Gel
Pocket Spring
Depth (cm)
22
Layers
4
Layer Details
ActiCool knitted cover
A knitted ActiCool cover that is described as instantly cooling, so the surface feels cooler to the touch when you get into bed.
ActiGel foam
A cooling ActiGel foam layer, listed by a retailer as 6cm, that is designed to optimise airflow. That means less heat building up under you as you sleep.
I-Fibre and Platinum 3D
Breathable layers of recyclable I-Fibre and Platinum 3D polyester. They add cushioning while letting air move through the mattress.
Pocket springs
Pocket springs, listed by the brand at 1,000, form the supportive core. TheraPur doesn't publish a spring size.
Layer details from dreams.co.uk product page, November 2026.
Key benefits
- Sized for the typical bedroom: We suggest a room of at least 2.6m x 2.8m for a UK double, which in many bedrooms still leaves space for bedside tables on both sides.
- Cooler when two of you share: Two people at 67.5cm each give off more warmth, and the breathable ActiGel foam and fibre layers are designed to let that warmth move away.
- A little easier up the stairs: At 4ft 6in x 6ft 3in, the UK double is 15cm narrower than the UK king, which can help on a turning staircase in an older terrace.
- Bedding you can find anywhere: Standard double sheets and a 200 x 200cm double duvet fit, which helps if you're furnishing a whole home at once and want sensible bedding costs.
- A safe pick for a guest room: The medium rating suits most back and side sleepers, so visiting couples are unlikely to find it too extreme in either direction.
This size suits you if...
You share the bed with a partner in a bedroom of around 2.6m x 2.8m or a little more and want to keep room for furniture around it, or one of you sleeps warm and you'd like a cooler surface in the classic double footprint.
Consider another size if...
You're both tall or broad and 67.5cm each already feels cramped. We'd recommend the UK king instead, which gives 75cm each; allow at least 2.7m x 2.9m for the UK king.
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FAQ's
Is the TheraPur ActiGel Polar 1000 UK double big enough for two people?
For most couples who sleep fairly close, yes. The UK double gives 67.5cm each, which is 7.5cm less each than the UK king. If one of you sprawls or you're both broad-shouldered, the UK king will feel noticeably roomier, provided your bedroom can take it.
Will a TheraPur ActiGel Polar 1000 double fit in a small bedroom?
We suggest at least 2.6m x 2.8m for the UK double, with around 3m x 3m feeling comfortable once you add a wardrobe and drawers. In a second bedroom or first flat below our suggested minimum, the UK single may be the more practical option.
What sheets fit the TheraPur ActiGel Polar 1000 in a double?
Standard UK double fitted sheets work, along with a 200 x 200cm double duvet. The mattress is 22cm deep, so check that the fitted sheet's pocket depth covers that before you buy, or the corners may pull off during the night.
How much bigger is the UK king than the UK double TheraPur ActiGel Polar 1000?
The UK king is 15cm wider and 10cm longer than the UK double. That extra length matters if either of you is tall. We suggest at least 2.7m x 2.9m for the UK king, so measure the room and stairs first, then compare the retailers listed on this page.
Should one person buy a UK double or UK single TheraPur ActiGel Polar 1000?
If you sleep alone but a dog or cat claims a corner, the UK double's extra 45cm of width over the UK single makes a real difference. Both are the same length. If space is tight, the UK single needs at least 2.1m x 2.8m.