Harrison Spinks Ruby 12500 Pocket Double Mattress (Firmer Feel)
The Harrison Spinks Ruby 12500 Pocket Mattress (Firmer Feel) is a pocket spring mattress with a firm feel.
- Designed firm from the start
- Localised support at hips & shoulders
- From a long-established British maker
£1,629
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Harrison Spinks Ruby 12500 Pocket Mattress (Firmer Feel)
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Mattress details
Mattress
Harrison Spinks Ruby 12500 Pocket Mattress (Firmer Feel)
Size
Firmness
Firm
Construction
Pocket Spring
Wool
Natural
Depth (cm)
Layers
5
Layer Details
Mini pocket springs
Small, individually cased springs sit in the comfort layer and add cushioning while cutting down motion transfer. In practice, you get a little give on top of the firm feel, and less disturbance when a partner moves.
Wool
Wool comfort filling, described as a natural insulator with temperature-regulating properties. It helps keep you from getting too warm or too cool as the night goes on.
Cotton
Natural cotton fibres create a fresh sleeping environment and wick away moisture. That should help the surface feel drier and fresher, especially if you tend to sleep warm.
Hemp
Hemp is an eco-friendly fibre that is naturally breathable and durable. It lets air move through the filling and should help the mattress keep its feel over time.
Flax
Flax fibres are durable and breathable, and are described as having anti-bacterial properties. This is a hard-wearing natural layer that adds to the airy feel of the fillings above it.
Layer details from mattressonline.co.uk and simplybedssussex.co.uk product pages, October 2026.
Key benefits
- Made for the typical UK bedroom: At 135 x 190cm the UK double fits where a king would dominate, and we suggest a room of at least 2.6m x 2.8m.
- Room for bedside tables on both sides: In most doubles-and-wardrobe bedrooms this size still leaves space for a table each side, which matters more than an extra 15cm of mattress for many couples.
- Pocket springs where each of you lies: The springs move independently, which means a heavier partner sinking in on one side won't tilt the firm surface under you.
- 67.5cm of width each: Two people sharing get 67.5cm each, enough for most couples, although restless sleepers who spread out may feel the edges.
- A sensible guest room choice: A firm UK double suits visiting couples of unknown preferences better than most sizes, and the 4ft 6in x 6ft 3in footprint leaves a spare room usable.
This size suits you if...
You're a couple in a typical UK bedroom and want the traditional shared size rather than the biggest bed the wall will take, you're furnishing a guest room that hosts visiting couples, or you sleep alone and want space to spread out on a firm surface. It also suits older houses with turning staircases, where a UK double is easier to get upstairs than anything wider.
Consider another size if...
You both like to sprawl, or one of you is a restless sleeper, because 67.5cm each can feel snug. We'd recommend the UK king instead: it's 15cm wider and 10cm longer, and we suggest a room of at least 2.7m x 2.9m for it.
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FAQ's
Is the Harrison Spinks Ruby 12500 double big enough for two adults?
Yes, for most couples. The UK double gives 67.5cm each for two people sharing, and because the pocket springs respond independently on each side, you won't roll towards a heavier partner. Broad-shouldered couples or anyone who moves a lot at night may prefer the UK king, which is 15cm wider.
What room size do I need for the Ruby 12500 in a UK double?
We suggest at least 2.6m x 2.8m, with around 3m x 3m the comfortable norm. That allows walking space around the bed and, in most rooms, a bedside table on each side. The mattress itself is 135 x 190cm, or 4ft 6in x 6ft 3in.
Should I choose the Ruby 12500 in a double or a king?
The UK double suits rooms where a king would crowd out wardrobes and drawers, and it's the traditional couples' size. The UK king is 15cm wider and 10cm longer, so sprawlers and taller sleepers gain from it if the room allows at least 2.7m x 2.9m. Measure before deciding.
Will a UK double mattress fit up a narrow staircase?
Usually, yes. At 135cm wide the UK double is one of the easier sizes to manoeuvre around turning stairs in older terraces or tight new build landings. A pocket spring mattress like this one has some flex but shouldn't be folded, so check your tightest corner against 135 x 190cm first.
Is the Ruby 12500 double a good guest room mattress?
It's a strong candidate if your guests are often couples: the UK double sleeps two while leaving a spare room usable, and double bedding is stocked everywhere. The firm feel is a consideration though, since lightweight side sleepers among your guests may find it a little unyielding at the shoulder.