Harrison Spinks Bronze 3500 Pocket Ortho Mattress (Medium Feel)
Mattress
Harrison Spinks Bronze 3500 Pocket Ortho Mattress (Medium Feel)
Size
Firmness
Medium
Construction
Depth (cm)
27
Layers
6
Layer Details
- Cover. An in-house woven cover made without FR chemicals, meeting fire safety standards naturally. That means a healthier sleep environment without chemical treatments.
- Wool. A layer of British wool gives a plush, sumptuous sleeping surface. Wool also regulates temperature well, which helps if you tend to sleep warm.
- Cotton, Hemp and Flax blend. This blended layer wicks away moisture, which means the surface stays feeling fresher through the night.
- Hemp and Ecotex. Hemp and strong Ecotex fibres complete the comfort layers, adding durability and structure beneath the softer fillings.
- Micro springs. Layers of 2500 micro springs sit beneath the fillings, providing extra bounce that adapts to your body shape.
- Pocket Springs. The base layer holds 1000 Cortec™ Quad Revolution® pocket springs, with each dual spring in a cloth pocket and secured in groups of four. This gives independent, targeted support and helps limit partner disturbance.
Layer details from mattressonline.co.uk product page, September 2026.
- Room to spread out alone: At 120cm across, the UK small double is 30cm wider than the UK single, which means a solo sleeper can change position freely without meeting the edge.
- Fits rooms a double overwhelms: Being 15cm narrower than the UK double, this size can be the difference between a door that clears the bed frame and one that doesn't.
- Springs suited to shared occasional use: The 1000 pocket springs move independently, so if a partner joins you for the odd night in a guest room, their movement is less likely to wake you.
- Natural fillings in a compact size: British wool, cotton, hemp and flax wick moisture and regulate temperature, useful in smaller rooms where air can feel stuffier overnight.
- Standard 4ft bedding and frames: The small double is an established UK size, so fitted sheets and frames are easy to find, and a standard double duvet works fine on top.
This size suits you if...
You sleep alone and have outgrown a single but your bedroom can't take a full double, or you're furnishing a guest room, loft conversion or rental where couples stay occasionally rather than every night. It also suits a teenager who needs more bed without giving up floor space. We suggest allowing a room of at least 2.4m x 2.8m for this size.
Consider another size if...
You share the bed every night, because 120cm is a squeeze for two adults long term. We'd recommend the UK double instead, which is 15cm wider and needs a room of at least 2.6m x 2.8m.
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Is the Harrison Spinks Bronze 3500 small double big enough for a couple?
For occasional nights, yes. The pocket springs limit partner disturbance, so a visiting couple in a guest room should sleep reasonably well. At 120cm wide, it's a squeeze for two adults every night, and the softer medium feel means heavier couples in particular would be better served by the UK double or UK king.
What room size do I need for a small double mattress?
We suggest allowing at least 2.4m x 2.8m for a UK small double, which leaves enough clearance to walk around the bed and open drawers. This is our own guidance rather than the manufacturer's, so measure your room, including door swing and any sloped ceilings, before committing.
How much bigger is a small double than a single?
The UK small double is 30cm wider than the UK single, and the two are the same length at 190cm. That extra width is what makes it work for a solo adult who likes to spread out, or a teenager who has outgrown a single but can't spare the floor space a double would take.
Will the Harrison Spinks Bronze 3500 small double fit in a loft conversion?
Often, yes, and this is where the size makes most sense. Being 15cm narrower than a UK double can preserve standing room beside the bed under a sloped ceiling. Measure the usable floor area at head height, and remember the mattress itself is 27cm deep, which affects clearance too.
Where can I buy the Bronze 3500 in a small double?
Stock varies by size, and the small double isn't always as widely listed as the UK double or UK king. The simplest approach is to compare the retailers shown on this page, as the prices here are updated whenever retailers change them.