Mattress Online Contract Comfort Pro King Size Mattress
The Contract Comfort Pro is a 14cm foam mattress from Mattress Online, built with a 10cm Ecofoam base made from 100% recycled foam and a 4cm Reflex foam comfort layer.
- Fire-rated for rentals & B&Bs
- Supportive feel that holds its shape
- 100-night trial & 10-year guarantee
£174
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Mattress Online Contract Comfort Pro Mattress
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Mattress details
Mattress
Mattress Online Contract Comfort Pro Mattress
Size
Firmness
Medium Firm
Construction
Foam
Depth (cm)
14
Layers
2
Layer Details
Ecofoam
A 10cm base layer of Ecofoam made from 100% recycled foam, which means firm, deep-down support from a resilient structure. It's the backbone of the mattress and the reason for its solid feel.
Reflex Foam
A 4cm top layer of Reflex foam that adds pressure relief, so your hips and shoulders get a little cushioning against the firm base. It also helps the mattress keep its shape over time.
Layer details from mattressonline.co.uk product page, September 2026.
Key benefits
- Proper space for two: At 75cm each for two people sharing, both of you can turn over without negotiating for territory.
- Less disturbance from a partner: If one of you gets up hours before the other, the extra width means less shuffling past each other and fewer accidental elbows.
- Length for taller sleepers: The 200cm length gives anyone approaching six foot room to stretch out without their feet meeting the bed frame.
- Medium firm support across the full width: The 10cm Ecofoam base keeps its solid, supportive feel right to the edges of the 150cm width, so neither sleeper sinks toward the middle.
- A low-cost route to king size: Upgrading to a UK king usually costs a premium, so a budget foam build makes the jump to more space more affordable for guest rooms and rentals.
This size suits you if...
You share the bed every night and a double has started to feel tight, you or your partner wake at different times and want fewer disturbances, or someone in the bed is approaching six foot and needs the 200cm length. It also fits landlords furnishing a rental where couples will sleep, since the fire certification suits commercial premises.
Consider another size if...
You sleep alone, or your room falls short of the 2.7m x 2.9m we suggest for a UK king. In either case we'd recommend the UK double instead, which needs a room of at least 2.6m x 2.8m.
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FAQ's
How big is the Contract Comfort Pro in a UK king?
The UK king measures 150 x 200cm, or 5ft x 6ft 6in. For two people sharing, that's 75cm each. The mattress itself is 14cm deep, which is slim for a king, so it sits lower on the frame than most everyday king mattresses. Check your bed base takes a 150 x 200cm mattress before ordering.
Is the UK king Contract Comfort Pro worth it over the double?
The UK king is 15cm wider and 10cm longer than the UK double, and gives 7.5cm more width each for two sharing. On a medium firm 14cm mattress like this, that extra personal space matters, because there's little soft depth to absorb a partner's movement. If your room fits a UK king, the width is the upgrade you'll feel.
What room size do I need for a king size Contract Comfort Pro?
We suggest a room of at least 2.7m x 2.9m for a UK king, with 3.2m x 3.2m feeling comfortable once wardrobes and bedside tables are in. New build master bedrooms can be tighter than they first appear, so measure with your furniture in place. If the room falls short, the UK double needs at least 2.6m x 2.8m.
Is the king size long enough for tall sleepers?
At 200cm, the UK king is 10cm longer than the UK single and the UK double, which is a genuine relief for anyone approaching six foot. If length is your main reason for upgrading, the UK king delivers it without needing the room space of a UK super king, which is 30cm wider but the same length.
Where can I buy the Contract Comfort Pro in a UK king?
Compare the retailers listed on this page. The prices shown here are updated as retailers change them, so it's the quickest way to see the current cost of the UK king before you buy.