TheraPur ActiGel Tundra 5000 Combination King Size 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
£1,759
Get the lowest price we've found
Save with the previous model
Some retailers still sell the earlier version of this mattress for less than the current model's best price.
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
- More room each than a double: You each get 75cm of width, which is 7.5cm more per person than a UK double, enough to stop elbows meeting when one of you turns over.
- Length for taller partners: At 200cm long, the UK king adds 10cm over a UK double, so a partner over six foot is less likely to have feet hanging off the end.
- Fewer early-morning disturbances: Individually wrapped springs move on their own, which means the partner who rises hours earlier is less likely to wake the one still asleep.
- Usable edges on a wider bed: A reinforced foam border supports the edges, so sitting down to get up feels steady, which is useful during recovery from injury or surgery.
- Firm support across the full width: The firm feel suits back and front sleepers best, and a little cushioning from the PurFibre layer keeps it from feeling harsh on either side of the bed.
This size suits you if...
You share the bed every night and have started to feel cramped in a UK double, one of you is tall enough that 190cm leaves your feet over the edge, or your working hours differ and you want to stop waking each other when one gets up.
Consider another size if...
Your bedroom is smaller than our suggested minimum of 2.7m x 2.9m. In that case we'd recommend the UK double instead, which needs at least 2.6m x 2.8m.
Similar Mattresses in This Price Range
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 much space does each person get on the TheraPur ActiGel Tundra 5000 in a UK king?
Each sleeper gets 75cm of width on the UK king, which is 7.5cm more per person than the UK double's 67.5cm. If you share with a dog that sleeps on the bed every night, that extra room makes a real difference, although a UK super king, at 90cm each, gives more.
Is the UK king Tundra 5000 long enough for someone over 6ft?
It's 200cm (6ft 6in) long, 10cm more than the UK double and the UK small double. For a partner who is six foot or a little taller, that extra length matters more than the extra width, because it gives room at the foot of the bed.
What size bedroom do I need for a UK king TheraPur Tundra 5000?
Allow at least 2.7m x 2.9m, and 3.2m x 3.2m is more comfortable. New build main bedrooms can feel tighter than their floor plan suggests once fitted wardrobes are in, so measure the actual free floor space rather than relying on the room's listed size.
Should couples choose the UK king or UK super king Tundra 5000?
The UK super king gives 90cm each against 75cm on the UK king, and both are 200cm long. If you have the floor space, at least 3m x 2.9m, the UK super king suits restless sleepers better. Most couples upgrading from a UK double will find the UK king enough.
Will I feel my partner move on a king size Tundra 5000?
You are less likely to. The individually wrapped springs absorb movement, and on a UK king each of you has 75cm of space, so there is more distance between you. That helps during pregnancy, when one partner moves pillows around and shifts position often through the night.