TheraPur ActiGel Polar 1000 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
£499
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The TheraPur ActiGel Polar 1000 is a 22cm-deep pocket spring mattress with a knitted ActiCool cover and cooling ActiGel foam, aimed at people who run warm. It's rated medium, so it suits sleepers who want neither plush nor firm. It comes in a UK single, UK double and UK king. Dreams offers a 100-night trial, and there's a 1-year guarantee.
Mattress specifications
Firmness
Medium
Type
Pocket Spring
Depth (cm)
22
Number of Layers
4
Trial Period (nights)
100
Warranty (years)
1
Price Range
£499 to £699
Best Sleeping Position(s)
Back Sleeping
Combination Sleeping
Side Sleeping
Certifications
Assessed from Therapur's published specification for this mattress, captured November 2026, and from regular price comparison across our UK retail partners.
Why should you choose this mattress?
The main draw is temperature. The knitted ActiCool cover is described as instantly cooling, and the ActiGel foam is designed to optimise airflow, which means less trapped heat if you sleep warm. Pocket springs and breathable I-Fibre and Platinum 3D layers add to the airflow. A medium rating suits most back and side sleepers, although heavier sleepers who want firm support may prefer something firmer. It also has a fully hypoallergenic finish and antibacterial fillings, which helps if you're sensitive to allergens. It's made in the UK.
Key features & 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.
Best suited for?
Warm sleepers
The knitted ActiCool cover feels cool to the touch and the ActiGel foam is designed to optimise airflow, so less heat builds up under you overnight.
Back sleepers
A medium rating sits between plush and firm, and the pocket spring core gives supportive feel that suits most people lying on their backs.
Side sleepers
Medium firmness with cushioning from the I-Fibre and Platinum 3D layers gives some comfort at the shoulder and hip without feeling overly firm.
Allergy sufferers
A fully hypoallergenic finish and antibacterial fillings make this a sensible pick if you are sensitive to allergens.
Eco-conscious buyers
The I-Fibre and Platinum 3D polyester layers are recyclable, and the mattress is made in the UK.
If you prefer sleeping on a firm mattress, this might not be the best choice, as it's rated medium. Anyone wanting a very soft, sink-in feel may find it too supportive. It isn't flippable either, and the guarantee is 1 year, which may matter if you want longer cover.
Save on an earlier or ex-display model
Some retailers still sell the earlier version of this mattress, or ex-display and returned stock at a lower price. These are the sizes where it costs less than the current model's best price.
TheraPur ActiGel Polar 1000 Mattress
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FAQ's
How firm is the TheraPur ActiGel Polar 1000 Mattress?
It's rated medium, so it sits between soft and firm. That suits most back and side sleepers, although anyone who wants a distinctly firm or very soft feel will be better served by a different mattress.
What sizes does the TheraPur ActiGel Polar 1000 come in?
It comes in a UK single, UK double and UK king. TheraPur doesn't list a UK small double or UK super king on its own page, so check before assuming those are available.
How deep is the TheraPur ActiGel Polar 1000 Mattress?
It's 22cm deep. That's a fairly slim profile, so it should be easy to fit to most bed frames, but do check the depth against any headboard or frame you plan to use.
Does the TheraPur ActiGel Polar 1000 come with a trial or guarantee?
Dreams offers a 100-night trial, and the mattress has a 1-year guarantee. The trial is Dreams' own offer, so check its terms before you buy.
Is the TheraPur ActiGel Polar 1000 good for hot sleepers?
It's designed for it. The knitted ActiCool cover is described as instantly cooling, and the ActiGel foam is built to optimise airflow. Results vary from person to person, though, and very warm sleepers should still choose lighter bedding.
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