Komfi Unity Memory Deluxe King Size Mattress
The Komfi Unity Memory Deluxe is an all-foam mattress rated medium to firm, with a Neuform memory foam top layer over reflex foam.
- Memory foam eases pressure points
- Minimises partner disturbance
- Cooler than traditional memory foam
£280
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Komfi Unity Memory Deluxe Mattress
More available sizes
Mattress details
Mattress
Komfi Unity Memory Deluxe Mattress
Size
Firmness
Medium Firm
Construction
Foam
Memory Foam
Depth (cm)
17
Layers
3
Layer Details
Neuform Memory Foam
A specialised Neuform memory foam layer sits at the top, cushioning you and lifting pressure off joints and muscles. It's also designed to reduce heat, which means a slightly cooler night than traditional memory foam tends to give.
Reflex Foam
At the heart of the mattress, this soft, flexible reflex foam shapes around your contours. It absorbs movement and limits motion transfer, so a restless partner is less likely to wake you.
Ecofoam
The base layer is Ecofoam, made from recycled foam and fully recyclable. It's a modest but genuine plus if sustainability matters to you.
Layer details from mattressonline.co.uk product page, September 2026.
Key benefits
- Proper space for two: At 75cm each for two people sharing, you both get room to change position without negotiating for it.
- Less partner disturbance: The reflex foam core absorbs movement, which means an early alarm on one side is far less likely to travel across 150cm of mattress.
- Extra length for taller sleepers: The UK king is 10cm longer than the UK double at 200cm, so anyone nearing six foot stops sleeping diagonally.
- Budget-friendly in a big size: Larger sizes are usually where prices climb steeply, and this all-foam build keeps the king within reach of most budgets.
- Cooler memory foam feel: The Neuform top layer is designed to reduce heat, useful across a wide king where two bodies generate more warmth than one.
This size suits you if...
You share the bed every night and have outgrown a double, especially if you and your partner keep different hours and one of you slips out early while the other sleeps on. It also fits if one of you is approaching six foot and needs the extra 10cm of length, or if a dog has quietly become a permanent third occupant and a double no longer stretches to everyone.
Consider another size if...
Your bedroom is smaller than the 2.7m x 2.9m we suggest as a minimum for a UK king. We'd recommend the UK double instead, which needs at least 2.6m x 2.8m and still sleeps two comfortably.
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FAQ's
Is the Komfi Unity Memory Deluxe in a UK king good for couples?
Yes, and it's arguably the size where this mattress makes most sense for two. You get 75cm each for two people sharing, and the reflex foam core limits motion transfer, so a restless partner or an early riser causes less disturbance. Lighter couples suit it best, as the 17cm depth is a little shallow for heavier adults.
Will a UK king fit in a new build master bedroom?
Often, but measure first. New build masters can be smaller than they look once fitted wardrobes go in. We suggest at least 2.7m x 2.9m for a UK king, with 3.2m x 3.2m feeling comfortable. If your room falls short, the UK double needs at least 2.6m x 2.8m and may be the wiser fit.
Is the king size long enough for someone over six foot?
It helps considerably. The UK king is 200cm long, which is 10cm more than the UK double, so a taller sleeper's feet are less likely to hang over the end. If you're well over six foot, even 200cm can feel snug, but it's the same length as a UK super king, so sizing up won't add more.
How big is the Komfi Unity Memory Deluxe in a UK king?
It measures 150 x 200cm, or 5ft x 6ft 6in. That makes it 15cm wider and 10cm longer than the UK double, a difference you notice most when sharing: turning over, propping up pillows during pregnancy, or getting in and out carefully after an injury all become easier with the extra margin.
Where can I compare prices for the king size?
Use the live price table on this page. The prices shown here are updated as retailers change them, so it's a more reliable picture than a figure printed in the text. King is one of the most widely made UK sizes, and comparing the retailers listed here means you'll catch any discounting as it happens.