Mattress Online HydroShield Classic Single Mattress
The HydroShield Classic is a simple, low-cost foam mattress from Mattress Online, available in UK Single, Double and King.
- Water-resistant, wipe-clean cover
- Recovers its shape between sleepers
- 100-night trial & 10-year guarantee
£148
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Mattress Online HydroShield Classic Mattress
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Mattress details
Mattress
Mattress Online HydroShield Classic Mattress
Size
Firmness
Medium Firm
Construction
Foam
Rolled
Depth (cm)
10
Layers
Layer Details
Ecofoam
A 10cm layer of Ecofoam made entirely from recycled materials, which means it supports a variety of body shapes while keeping waste out of landfill. It has natural rebound, so it returns to shape between sleepers rather than sagging where the last person lay.
Layer details from mattressonline.co.uk product page, September 2026.
Key benefits
- A sensible match for children's rooms: The water-resistant cover shrugs off spills and accidents, which in a child's room, where the bed shares space with toys and a desk, is genuinely useful.
- Slim enough for raised frames: At 10cm deep, this single sits comfortably within the depth limits of bunk beds, cabin beds and mid sleepers, where a thicker mattress can breach the safety rail.
- Fits where bigger sizes can't: At 90cm wide it slots under a loft slope or into a box room, and two singles plus a walkway will fit where one double dominates.
- Recovers between guests: The Ecofoam core has natural rebound, so a spare-room single used a few nights a month won't hold the shape of the last visitor.
- Low-cost way to furnish a student let: If a first flat or student room comes with a frame but no mattress, this single is a cheap, easy-to-clean fix that meets commercial fire safety standards.
This size suits you if...
You're buying for a child or teenager and want something wipe-clean rather than precious, you need a slim mattress for a bunk, cabin or mid-sleeper frame, or you're kitting out a spare room, student let or rental where the bed gets occasional rather than nightly use. It also suits a compact room where 90cm of width is all the floor plan allows.
Consider another size if...
You're an adult planning to sleep on it every night and would like more room to spread out. We'd recommend the UK double instead, which is 45cm wider and the same length; allow at least 2.6m x 2.8m of floor space for it.
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FAQ's
Will the HydroShield Classic single fit a bunk bed?
Yes, and it's one of the better matches for one. Bunk beds, cabin beds and mid sleepers usually cap mattress depth so the safety rail stays effective, and at 10cm this mattress sits well within that. The UK single's 90 x 190cm footprint is the standard for most UK bunk frames, though measure yours before ordering.
Is the HydroShield Classic single okay for a child's everyday bed?
For a child or lighter teenager, yes. The medium to firm Ecofoam supports smaller bodies well, and the water-resistant cover copes with the spills and accidents that come with a kid's room. Heavier adults sleeping on it nightly are a different matter; the 10cm depth offers less cushioning than a full-depth mattress.
What room size do I need for a UK single mattress?
We suggest at least 2.1m x 2.8m of floor space for a UK single, which leaves room to walk alongside the bed and open a wardrobe or drawers. That makes it workable in box rooms, lofts with sloping ceilings and shared children's rooms where two singles and a walkway need to fit.
How much smaller is the UK single than the UK double HydroShield?
The UK single is 45cm narrower than the UK double, and the two are the same length. The UK double gives 67.5cm each for two people sharing, so if this mattress will ever sleep a couple, the UK single won't do. For one adult who likes space, the UK double is the comfortable step up.
Can two HydroShield singles work in a guest room instead of one double?
Often, yes. Two UK singles give hosts flexibility: friends travelling together get a bed each, and you can push them together for a couple. Each needs 90 x 190cm of floor plus walkway space, so measure first. The wipe-clean covers and shape recovery between visitors suit occasional guest use well.