Harrison Spinks Diamond 25000 Pocket Mattress (Soft to Medium Feel)
Mattress
Harrison Spinks Diamond 25000 Pocket Mattress (Soft to Medium Feel)
Size
Firmness
Medium Soft
Construction
Depth (cm)
32
Layers
7
Layer Details
- Comfort Layer - Top Surface (Summer Side). The summer side puts moisture wicking cotton closest to you. In practice that means a cooler, drier feel on warm nights.
- Comfort Layer - Moisture Wicking Blend. Further layers of cotton, hemp and flax fibres draw moisture away from your body. This adds to that refreshing feel rather than letting heat and dampness build up.
- Comfort Layer - Breathability Blend. A blend of British wool, hemp and flax fibres improves durability within the comfort layers. Natural fibres like these tend to hold their loft well over time.
- Comfort Layer - Luxury Blend. Wool, mohair and cashmere sit here to deepen the indulgent feel. These are the fillings that give the surface its soft, expensive-feeling finish.
- Comfort Layer - British Wool. Layers of British wool provide snug, cushioned comfort. Wool also regulates temperature naturally, which helps across the seasons.
- Support Layer - Mini Pocket Springs. 24,300 mini springs create many more points of contact with your body. That means comfort delivered exactly where you need it, with less of the hammocking a coarser spring layer can cause.
- Support Layer - Cortec Quad Springs. 700 of Harrison Spinks' award-winning Cortec Quad springs form the core, secured in groups of four within one fabric pocket. This grouped design gives responsive, stable support at the base of the mattress.
Layer details from mattressonline.co.uk product page, September 2026.
- Fits almost any room: At 90cm wide, we suggest a room of just 2.1m x 2.8m, so it leaves floor space for a desk, wardrobe or toy storage.
- Grown-up comfort in a single: Wool, cashmere and mohair fillings are rare at this size, which means a teen or regular guest gets the same surface an adult would choose.
- Precise support for one sleeper: The mini pocket springs create many points of contact across a narrow surface, so a lighter solo sleeper still sinks in rather than perching on top.
- Naturally cool for small rooms: Cotton, hemp and flax wick moisture away, useful in box rooms and loft conversions where warm air tends to gather.
- Easy, cheap bedding: Standard single sheets and a 135 x 200cm single duvet fit, the most widely stocked and affordable bedding of any UK size.
- Manageable to turn at this size: The seasonal turn design is heavy work in larger sizes, but a UK single is the easiest version of this mattress to flip.
This size suits you if...
You sleep alone in a compact room, a loft conversion or a first flat and want natural fillings rather than foam. It also suits a teenager moving up to a bed built to last, or a guest room where you'd rather visitors slept on something genuinely comfortable than on an afterthought.
Consider another size if...
You're a single adult with the floor space to spare, since 90cm is snug if you move around at night. We'd recommend the UK double instead, which is 45cm wider and the same length; allow at least 2.6m x 2.8m for it.
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What size is the Harrison Spinks Diamond 25000 UK single?
It measures 90 x 190cm, which is 3ft x 6ft 3in, the standard UK one-person size. Bear in mind the depth: at 32cm this is a much taller mattress than most singles, so check your bed frame's rail height and existing fitted sheets before ordering.
Will the Diamond 25000 UK single fit a bunk bed or mid sleeper?
We'd be cautious. Raised frames usually specify a maximum mattress depth so the safety rail stays high enough, and at 32cm this mattress exceeds most of those limits. It's also heavy for lifting onto a top bunk. For a standard divan or bedstead it's fine; for bunks and cabin beds, check the frame's stated maximum first.
Is the UK single Diamond 25000 a good mattress for a child or teenager?
For a teenager, yes, if the budget allows: the soft to medium feel and precise mini springs suit lighter bodies well, and the natural fillings should outlast their school years. For younger children it's arguably more mattress than they need, and an adult will have to handle the seasonal turning, as it's a heavy, deep mattress.
How much room do I need for a UK single mattress?
We suggest allowing at least 2.1m x 2.8m of floor space. That leaves enough clearance to make the bed and open drawers or a wardrobe. In a loft conversion, the narrow 90cm footprint also makes it easier to tuck the bed under the slope while keeping standing height where you walk.
Do two UK singles work better than one double in a guest room?
Often, yes. Two UK singles let guests sleep separately or be pushed together for couples, and each is easier to move than a larger mattress. The Diamond 25000's UK single is a generous choice for guests, though at this price point most people reserve it for a bed that's slept on every night.