Mattress Online HydroShield Comfort Double Mattress
The HydroShield Comfort is Mattress Online's own-brand foam mattress, available in UK Single, Double and King sizes.
- Water-resistant cover for kids' rooms
- Reflex foam top eases pressure
- 100-night trial & 10-year guarantee
£239
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Mattress Online HydroShield Comfort Mattress
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Mattress details
Mattress
Mattress Online HydroShield Comfort Mattress
Size
Firmness
Medium Firm
Construction
Foam
Eco-Friendly
Depth (cm)
14
Layers
2
Layer Details
Ecofoam
A 10cm layer made from 100% recycled foam, which means the bulk of the mattress does the supportive work while keeping materials out of landfill. It gives the mattress its medium to firm character.
Reflex Foam
A 4cm layer of Reflex foam sits above, adding pressure-relieving comfort where your body meets the mattress. It also adds durability, helpful in a single-sided design you can't flip.
Layer details from mattressonline.co.uk product page, September 2026.
Key benefits
- A footprint most bedrooms can take: At 135 x 190cm, or 4ft 6in x 6ft 3in, it fits the average UK bedroom with space left over for a wardrobe and drawers.
- Room for bedside tables on both sides: In a room of our suggested 2.6m x 2.8m minimum, the UK double still leaves enough width for a table each side of the bed.
- The established size for two: Two people sharing get 67.5cm each, which works well for couples who sleep close rather than sprawled.
- A sensible guest room choice: The water-resistant cover and medium to firm feel make it easy to keep fresh between visiting couples.
- Recycled foam underneath you: The 10cm Ecofoam layer is made from 100% recycled foam, so the supportive bulk of the mattress keeps material out of landfill.
- Simple to dress: Standard double sheets and a 200 x 200cm double duvet are sold everywhere, at every price point.
This size suits you if...
You're a couple in a typical UK bedroom and want the classic shared size, you're furnishing a guest room that needs to handle visiting pairs, or you sleep alone and like space to stretch, perhaps with a pet claiming a corner. The medium to firm feel should suit you if you sleep on your back or front.
Consider another size if...
You share every night and find 67.5cm each a little tight, especially with a restless partner. We'd recommend the UK king instead, which gives 75cm each for two sharing; allow at least 2.7m x 2.9m of room for it.
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FAQ's
Is the HydroShield Comfort in a UK double big enough for a couple?
For most couples, yes. Two people sharing get 67.5cm of width each, which is comfortable if you sleep fairly close. If one of you moves around a lot, the UK king version gives 75cm each, 7.5cm more per person, and is also 10cm longer, so taller sleepers gain legroom too.
What size room do I need for the HydroShield Comfort UK double?
We suggest a minimum of 2.6m x 2.8m, with around 3m x 3m being the comfortable norm. That allows walking space on both sides of the 135cm-wide mattress and room for bedside tables, which matters if two of you use the bed every night.
Should I buy the HydroShield Comfort in a UK double or a UK king?
The UK double is 15cm narrower and 10cm shorter than the UK king, and it suits rooms where a king would dominate. Choose the UK king if you share nightly and value space over floor area, but check your room first: we suggest at least 2.7m x 2.9m for that size.
Does the HydroShield Comfort UK double suit a guest room?
It's a strong fit. The UK double handles visiting couples as well as solo guests, the water-resistant cover gives some protection between stays, and the 14cm depth keeps the bed low-profile in a smaller second bedroom. The medium to firm feel is a safe middle ground for guests you can't ask in advance.
What bedding fits this mattress in a UK double?
Standard UK double sheets and a 200 x 200cm double duvet. Because the double is Britain's long-standing standard size, bedding is stocked in every supermarket and department store, so replacing sheets is cheap and easy, a genuine plus if this bed is for guests or a first flat.