Rem-Fit 600 Lux Black Edition King Size Mattress
The Rem-Fit 600 Lux Black Edition is a hybrid mattress, which means it pairs foam comfort with sprung support.
- Open-cell foam reduces heat build-up
- Minimises partner disturbance
- Medium-firm for back & front sleepers
£679.99
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Rem-Fit 600 Lux Black Edition Mattress
More available sizes
Mattress details
Mattress
Rem-Fit 600 Lux Black Edition Mattress
Size
Firmness
Medium Firm
Construction
Foam
Pocket Spring
Hybrid
Memory Foam
Depth (cm)
25
Layers
2
Layer Details
Memory foam
A cool, breathable open-cell memory foam sits at the top of the mattress. The open-cell structure lets air move through more freely, which means the contouring comfort of memory foam with less trapped heat.
Spring system
Beneath the foam is an advanced dual-layer spring system with 4000 contouring pocket springs. Each spring moves independently, so support adapts to your shape and movement transfers less across the bed.
Layer details from rem-fit.co.uk product page, September 2026.
Key benefits
- More room each than a double: Compared with the UK double, a UK king gives each of you 7.5cm more width, which means fewer shared elbows and knees in the middle of the night.
- Extra length for a taller partner: The UK king is 10cm longer than the UK double, so a tall partner can lie straight without their feet reaching the very end of the mattress.
- Calmer nights on different schedules: If one of you is up and out hours before the other, the extra width plus individually moving springs should keep that early exit on their side of the bed.
- Space without super king demands: We suggest a room of at least 2.7m x 2.9m for a UK king, against at least 3m x 2.9m for the UK super king.
- Metric and imperial at a glance: At 150 x 200cm, or 5ft x 6ft 6in, the UK king is easy to check against an existing bed frame before you buy.
This size suits you if...
You share the bed every night and keep drifting into each other on a UK double, one of you is tall enough that a 190cm mattress feels short, or your working hours differ and you want the early riser's movement to stay on their side.
Consider another size if...
Your bedroom is smaller than our suggested minimum of 2.7m x 2.9m for a UK king. We'd recommend the UK double instead, which we suggest fitting in a room of at least 2.6m x 2.8m.
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FAQ's
Is the Rem-Fit 600 Lux Black Edition UK king big enough for two people?
For most couples, yes. The UK king gives you 75cm each, compared with 67.5cm each on the UK double. If you both sprawl or one of you runs hot and wants distance, the UK super king gives 90cm each, although it needs a larger room.
Will a tall person fit on the Rem-Fit 600 Lux Black Edition king size?
The UK king is 200cm long, 10cm longer than the UK double, so it suits taller sleepers better than any smaller size. The UK super king is the same length, so sizing up again adds width only. If length is your main concern, the UK king already gives you all there is.
Does a UK king Rem-Fit 600 Lux reduce partner disturbance?
It should help. The 4000 pocket springs respond individually in every size, but the UK king adds distance between you, so movement has further to travel. Yes, you will still feel a partner climbing in, but a restless turn at night is less likely to reach your side than on the UK double.
Should I get the Rem-Fit 600 Lux Black Edition 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 enough. The UK super king is 30cm wider, giving 15cm more each, but we suggest at least 3m x 2.9m for it. Both are 200cm long, so the difference is width alone.
Is the Rem-Fit 600 Lux king a good size during pregnancy?
The UK king gives you room for a support pillow and frequent position changes without squeezing your partner off their 75cm. The 7.5/10 tension sits on the firmer side of medium, though, so if you are sleeping mostly on your side, it may feel slightly firm at the hip.