Tuft & Springs Ortho Tranquility 5000 King Size Mattress
The Tuft & Springs Ortho Tranquility 5000 is a firm pocket sprung mattress with natural fillings.
- Natural fillings wick away moisture
- Minimises partner disturbance
- Firm support that contours to you
£899
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Tuft & Springs Ortho Tranquility 5000 Mattress
More available sizes
Mattress details
Mattress
Tuft & Springs Ortho Tranquility 5000 Mattress
Size
Firmness
Firm
Construction
Pocket Spring
Wool
Orthopaedic
Natural
Eco-Friendly
Depth (cm)
32
Layers
3
Layer Details
Cover
A Belgian Damask viscose sleep surface that feels silky and soft to the touch. It's highly breathable, which helps keep the sleeping environment fresher through the night.
Comfort fillings
A blend of sustainably sourced British wool, cotton, cashmere and silk. These natural fibres breathe and wick moisture, which means you're less likely to overheat.
Support system
5,000 individually pocketed springs sit beneath the fillings. Each spring moves on its own, so the mattress contours to your body and responds where you need support.
Layer details from mattressnextday.co.uk product page, September 2026.
Key benefits
- Room of your own: Compared with the UK double, the UK king gives 7.5cm more each, which means less brushing elbows when you both turn over at two in the morning.
- Quieter early starts: Pocket springs move independently, so if your partner's alarm goes off hours before yours, their getting up is less likely to travel across the UK king to you.
- Length for taller sleepers: The UK king is 10cm longer than the UK double, so a partner over six foot is less likely to have feet hanging off the end.
- Firm across the full width: The firm support runs edge to edge, so both of you get the same steady base on your own side rather than one of you rolling towards the middle.
- Cooler for two: Two bodies make more heat, and the wool, cotton, cashmere and silk fillings wick moisture, which helps a shared UK king feel less clammy by morning.
This size suits you if...
You share a bed every night and keep waking when your partner shifts or gets up early, or one of you is tall enough that a double's length has started to feel short, and your bedroom allows at least 2.7m x 2.9m.
Consider another size if...
Your bedroom is under 2.7m x 2.9m once wardrobes are in, or you sleep alone. We'd recommend the UK double instead, which needs at least 2.6m x 2.8m.
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FAQ's
Is the Ortho Tranquility 5000 UK king big enough for two people?
For most couples, yes. The UK king gives 75cm each for two sharing, which is 7.5cm more each than the UK double. If you both spread out a lot, the UK super king gives 90cm each, 15cm more per person than the UK king, but we suggest at least 3m x 2.9m of room for it.
Will a UK king Ortho Tranquility 5000 help if my partner gets up earlier than me?
It should help on two counts. The 5,000 pocket springs move individually, so movement stays closer to where it starts, and the UK king puts 75cm of width on each side of the bed. Neither removes disturbance entirely, but together they give an early riser a better chance of slipping out unnoticed.
Is the UK king Ortho Tranquility 5000 long enough for someone over 6ft?
The UK king is 200cm long, 10cm longer than the UK double and the UK small double. That extra length is often the real reason taller couples move up. The UK super king is the same length as the UK king, so sizing up further adds width only, not length.
Should I get the Tuft & Springs Ortho Tranquility 5000 in a king or super king?
Choose the UK king if your room is at least 2.7m x 2.9m and 75cm each feels generous enough. The UK super king is 30cm wider and gives 90cm each, useful if a dog or child often joins you, but we suggest at least 3m x 2.9m for it.
What room size do I need for a Tuft & Springs king mattress?
We suggest at least 2.7m x 2.9m for the UK king, with 3.2m x 3.2m comfortable. New build master bedrooms can feel smaller once fitted wardrobes are in, so measure the floor you actually have free. At 32cm deep this mattress also sits fairly high, which helps when getting in and out.