TheraPur ActiGel Glacier 4000 Combination Mattress

Assessed from the specification published by dreams.ie, captured November 2026, and from regular price comparison across our UK retail partners.

The main draw is temperature. The graphite-infused ActiCool+ cover is described as TheraPur's coolest ever, and the ActiGel foam is said to relieve pressure without trapping heat, so it makes sense if you tend to wake up warm. Underneath, the pocket and micro springs are responsive and absorb motion, which should help if a partner moves about. Medium is a middle-ground feel that suits most sleeping positions, and the mattress is Good Housekeeping Institute Approved. At 28cm deep, it's a sensible height for most bed frames.

Warm sleepers
The graphite-infused ActiCool+ cover is described as TheraPur's coolest ever, and the ActiGel foam relieves pressure without trapping heat, so you should wake up less warm.

Couples
Responsive pocket and micro springs absorb motion, which should limit how much you feel your partner moving about during the night.

Combination sleepers
A medium feel sits in the middle ground and suits most sleeping positions, so it should work whether you switch between your back, side or front.

Side sleepers
Four centimetres of zoned ActiGel foam relieves pressure and gives cushioning where your body needs it, on a medium feel that suits most positions.

If you prefer sleeping on a firm mattress, this might not be the best choice. It's rated medium, so it sits in the middle rather than offering the flat, unyielding feel some people want. Very soft, sink-in comfort isn't the aim either. TheraPur also doesn't publish a spring count, so if that number matters to you, you won't find it here.

How firm is the TheraPur ActiGel Glacier 4000?

It has a medium comfort grade, which suits most sleeping positions. If you want a distinctly firm or very soft feel, a mattress at either end of the scale will suit you better.

What sizes does the TheraPur ActiGel Glacier 4000 come in?

It comes in a UK single, UK small double, UK double, UK king, UK super king and EU small single. Check the dimensions against your bed frame before ordering.

How deep is the TheraPur ActiGel Glacier 4000?

It's 28cm deep. That's a fairly standard height, so it should sit comfortably on most bed frames, though it's worth checking the depth of your frame's headboard and sides.

Is the TheraPur ActiGel Glacier 4000 good for hot sleepers?

It's designed with heat in mind. The graphite-infused cover is described as TheraPur's coolest ever, and the ActiGel foam offers pressure relief without trapping heat, so it's a reasonable choice if you sleep warm.

Does the TheraPur ActiGel Glacier 4000 come with a trial?

Dreams offers a 100-night comfort trial on it. That's the retailer's own offer rather than TheraPur's, so check Dreams' terms for returns and any fees before you buy.