TheraPur ActiGel Tundra 5000 Combination Small Double Mattress
The TheraPur ActiGel Tundra 5000 Combination Mattress pairs 5cm of zoned ActiGel foam with layers of pocket springs, which means a firm, supportive feel with pressure relief and temperature regulation built in.
- Firm feel for back & front sleepers
- Zoned foam helps regulate temperature
- Minimises partner disturbance
£1,599
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TheraPur ActiGel Tundra 5000 Combination Mattress
More available sizes
Mattress details
Mattress
TheraPur ActiGel Tundra 5000 Combination Mattress
Size
Firmness
Firm
Construction
Foam
Gel
Pocket Spring
Depth (cm)
30
Layers
5
Layer Details
ActiCool+ cover
A graphite-infused knitted cover right at the top of the mattress. It's the surface you feel first.
Zoned ActiGel foam
5cm of zoned ActiGel foam, there for pressure relief and temperature regulation. It adds some give to the firm feel and helps you stay comfortable through the night.
PurFibre comfort layer
A bouncy PurFibre layer that adds extra cushioning and comfort. It takes the edge off the firm feel without changing the mattress's firm rating.
Micro pocket springs
Two layers of supportive micro pocket springs that respond to even the slightest movement. They help the mattress adapt as you shift position.
Individually wrapped pocket springs
Individually wrapped, motion-absorbing pocket springs. Each spring moves on its own, so you're less likely to be disturbed by a partner.
Layer details from dreams.co.uk product page, November 2026.
Key benefits
- Room to stretch out alone: At 30cm wider than the UK single, a back or front sleeper can spread across the firm surface without ending up near the edge.
- Kinder to a small room: It's 15cm narrower than the UK double, which can be the difference between a box room door clearing the bed frame or catching on it.
- Quieter for occasional guests: The individually wrapped springs move independently, which means a couple staying for a weekend are less likely to feel each other turning over.
- Supported right to the side: A reinforced foam border supports the edges, which helps on a narrower bed where you'll often sleep or sit closer to the side.
- Easy to dress: Small double (4ft) fitted sheets fit and a standard double duvet covers it, so you won't be hunting for unusual bedding.
This size suits you if...
You sleep alone and want proper space to spread out on a firm mattress without giving up much floor, or you're furnishing a compact guest room or loft conversion where a couple stays now and then rather than every night.
Consider another size if...
You share the bed every night and want proper room each. We'd recommend the UK double instead, which gives 67.5cm each for two sharing; we suggest at least 2.6m x 2.8m for it.
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FAQ's
Is the TheraPur Tundra 5000 UK small double big enough for two people?
For occasional stays, yes: a couple visiting for a weekend will manage, and the wrapped springs help limit disturbance. For nightly sharing it's a little snug. The UK double gives 67.5cm each for two sharing, which most couples find more comfortable long term.
What size bedroom do I need for a UK small double mattress?
We suggest at least 2.4m x 2.8m for a UK small double, which leaves space to walk around the bed. If your room is tighter than that, the UK single is the safer choice, and for it we suggest at least 2.1m x 2.8m.
TheraPur Tundra 5000 small double vs double: which should I buy?
The UK small double is 15cm narrower than the UK double and the same length. Choose the UK small double if you sleep alone or your room is compact. Choose the UK double if two of you share nightly; we suggest at least 2.6m x 2.8m for that size.
What bedding fits a UK small double TheraPur Tundra 5000?
Small double (4ft) fitted sheets fit, paired with a standard double duvet. The mattress is 30cm deep, so check the pocket depth on any fitted sheet suits a mattress of that depth before you buy.
Is a small double TheraPur Tundra 5000 a good upgrade for a teenager?
It can be, if they've outgrown a UK single but the room can't spare much floor: it's 30cm wider at the same length. The firm feel suits back and front sleepers best, although a lighter teenager who sleeps on their side may find it hard on the shoulders and hips.