TheraPur ActiGel Alaska 6000 Combination Mattress
The TheraPur ActiGel Alaska 6000 Combination Mattress pairs a graphite-infused ActiCool+ cover with a 6cm layer of zoned ActiGel foam, which means a medium-soft feel that manages heat and supports where you need it.
- Graphite cover keeps you cooler
- Zoned foam support where needed
- Medium-soft feel for side sleepers
£1,519
Get the lowest price we've found
The TheraPur ActiGel Alaska 6000 is a foam mattress with a graphite-infused ActiCool+ cover over a zoned ActiGel foam layer. It's rated medium soft, so it suits sleepers who like some give, particularly on their side. It sits at the premium end of the market. It comes in a UK single, UK small double, UK double, UK king, UK super king and EU small single, and Dreams offers a 100-night trial.
Mattress specifications
Firmness
Medium Soft
Type
Foam
Depth (cm)
Number of Layers
2
Trial Period (nights)
100
Warranty (years)
Price Range
£1,519 to £2,399
Best Sleeping Position(s)
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 cover is the main draw. It's infused with graphite for heat control and moisture wicking, and TheraPur says ActiGel foam transfers heat faster than standard memory foam, so it should suit people who often wake up warm. Underneath, a 6cm layer of zoned foam is designed to support the areas that work hardest. The cover is also free from chemicals, and there's a Sleepmotion compatible option. Overall it suits most side sleepers and anyone who likes a softer feel, although heavier sleepers may want something with more resistance.
Key features & layer details
ActiCool+ cover
A graphite-infused cover at the very top of the mattress, designed for heat control and moisture wicking. It's the first thing you lie on, so it helps you stay cooler. The cover is also free from chemicals.
ActiGel zoned foam layer
A 6cm layer of zoned ActiGel foam, TheraPur's deepest, which supports the areas of your body that work hardest. TheraPur says ActiGel transfers heat faster than standard memory foam, so it should feel less warm too.
Layer details from dreams.co.uk product page, November 2026.
Best suited for?
Side sleepers
A medium soft feel with a 6cm layer of zoned ActiGel foam gives some give, which suits the way side sleeping presses on the body.
Warm sleepers
The graphite-infused ActiCool+ cover is made for heat control and moisture wicking, and ActiGel foam transfers heat faster than standard memory foam, so it should feel cooler.
Adjustable beds
A Sleepmotion compatible option is available, so this foam mattress can be paired with a Sleepmotion adjustable base.
If you prefer sleeping on a firm mattress, this might not be the best choice. It's rated medium soft, so it gives more than a medium or firm model. Heavier sleepers, and back or front sleepers who want a flat, unyielding surface, may find it too forgiving. TheraPur doesn't publish a depth for this mattress, which makes it harder to match to a deep bed frame.
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 Alaska 6000 Combination Mattress
Select a comparison article below or choose to compare this mattress side by side with up to 2 other mattresses.
Did you know? On Mattress Unboxed we have over 1,000 different mattresses to suit all types of sleepers. View all mattresses.
FAQ's
How firm is the TheraPur ActiGel Alaska 6000?
It's rated medium soft, with the brand describing it as a soft to medium comfort grade. That suits side sleepers and lighter sleepers who want some give, but anyone who wants a firm feel will probably find it too soft.
What sizes does the TheraPur ActiGel Alaska 6000 come in?
It comes in a UK single, UK small double, UK double, UK king and UK super king, plus an EU small single. That covers most standard UK bed frames, with the EU small single for narrower beds.
How deep is the TheraPur ActiGel Alaska 6000?
TheraPur doesn't publish a depth for this mattress. It does say the zoned ActiGel foam layer is 6cm, its deepest layer, but that's one layer and not the overall depth, so check with the retailer if your frame has depth limits.
Is the TheraPur ActiGel Alaska 6000 good for hot sleepers?
It's designed with heat in mind. The ActiCool+ cover is infused with graphite for heat control and moisture wicking, and the ActiGel foam transfers heat faster than standard memory foam. It should suit most warm sleepers, though no foam mattress will suit everyone.
Does the TheraPur ActiGel Alaska 6000 come with a trial?
Yes, Dreams offers a 100-night trial. That's the retailer's own offer, not TheraPur's, so check the terms with Dreams before you buy, including how returns work.
Couldn't find an answer to your question? Send us a message