Harrison Spinks Emerald 16500 Pocket Mattress (Medium Feel)
Mattress
Harrison Spinks Emerald 16500 Pocket Mattress (Medium Feel)
Size
Firmness
Medium
Construction
Depth (cm)
29
Layers
3
Layer Details
- Comfort fillings. Layers of natural British wool, cotton, hemp and flax fibres sit at the sleep surface. One side places wool closer to the top for winter warmth, while the other includes moisture-wicking cotton for summer freshness, so you flip the mattress with the seasons.
- Mini Pocket Springs. A layer of 15,800 mini springs delivers bouncy comfort, with the small pockets creating airflow throughout the mattress. They reach areas that broader springs can miss, such as the hips and lower spine.
- Support System. At the base, 700 Cortec™ Quad springs are encased in cloth pockets and secured into groups of four. They're highly responsive, providing support based on your unique weight, shape and movement.
Layer details from mattressonline.co.uk product page, September 2026.
- Room to sprawl on your own: At 120cm wide, the UK small double is 30cm wider than the UK single, which means a solo sleeper can stretch out properly without moving to a bigger room.
- A high-spec mattress that fits a small room: The 15cm saved against a UK double can be the difference between a door that clears the bed and one that doesn't in a box room or studio.
- Dual-sided fillings, flipped with the seasons: Wool sits closer to the surface on one side and moisture-wicking cotton on the other, so the same 4ft mattress works in a stuffy loft summer or a cold winter.
- Springs rather than foam at this width: The 16,500 springs give a buoyant, breathable feel, which suits a hot solo sleeper more than memory foam would in a smaller, warmer room.
- Standard 4ft sizing: The small double is a standard UK size, so frames and fitted sheets are straightforward to find, and it takes a normal double duvet.
This size suits you if...
You sleep alone but have outgrown a UK single, perhaps a teenager or an adult in a smaller second bedroom, and you want handcrafted quality without a bed that swallows the room. It also fits a loft conversion or downsized bedroom where a UK double would leave no standing room beside the bed, or a guest room where couples stay occasionally rather than every night.
Consider another size if...
You share the bed every night and your room can take a bigger frame. Sleeping two nightly on 120cm is a squeeze, so we'd recommend the UK double instead, allowing at least 2.6m x 2.8m of floor space.
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Is a small double Emerald 16500 big enough for a couple?
For occasional nights, yes: the responsive Cortec Quad springs adjust to each sleeper's weight and shape, so a visiting couple will be comfortable. For every night, 120cm of width is tight for two adults, and we'd point regular sharers towards the UK double, which is 15cm wider.
What room size do I need for the small double Emerald 16500?
We suggest a minimum of 2.4m x 2.8m, which is our own guidance rather than Harrison Spinks'. That allows walking space around a 120 x 190cm mattress. If your room is meaningfully larger than this, it may take a UK double, for which we suggest at least 2.6m x 2.8m.
How does the small double compare to the single in this mattress?
The UK small double is 30cm wider than the UK single, and the two are the same length at 190cm. That extra width is the whole point: same footprint front to back, noticeably more room to spread out side to side. The construction, fillings and 29cm depth are identical across both sizes.
Will the Emerald 16500 fit a standard 4ft bed frame?
Yes. The small double is a standard UK size at 120 x 190cm, so any 4ft frame should take it. Check your frame's stated size before ordering, and bear in mind this is a substantial 29cm-deep mattress, so measure headboard height if yours is on the shorter side.
Where can I buy the Emerald 16500 in a small double?
Compare the retailers listed on this page; the prices shown are updated as retailers change them. When ordering, check the firmness carefully, as the listing offers soft, medium and firm versions, and make sure the size selected reads UK small double, 120 x 190cm, before you pay.