Harrison Spinks Ruby 12500 Pocket Super King 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
£2,399
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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
- 90cm of width each: Two people sharing get 90cm each, which means you can spread out fully without ever meeting in the middle.
- Pocket springs across a bigger surface: Each spring moves independently, so at this width a partner turning over on their side is both cushioned and simply further away.
- Room for the whole household: Children wandering in at 3am, or a large dog treating the bed as routine, stop costing anyone their share of the mattress.
- 30cm wider than a UK king: The UK super king is 30cm wider than the UK king and the same length, a difference you feel every night.
- A firm feel that suits the space: The firm build holds its shape under two adults plus visitors, rather than sagging towards the heavier sleeper.
This size suits you if...
You share with a genuinely restless partner and have decided distance matters more than any comfort layer, your bedroom is a large master or period room where a UK king would look undersized, or children and pets regularly join you overnight and you want everyone to keep a proper share of the bed. You should also be settled on a firm feel, because this size is a serious commitment.
Consider another size if...
Your bedroom falls short of the 3m x 2.9m we suggest for a UK super king, or the door swing and landing turns make delivery doubtful. We'd recommend the UK king instead, which needs at least 2.7m x 2.9m.
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FAQ's
How much space do two people get on the Ruby 12500 super king?
Two people sharing get 90cm of width each on the UK super king, the most of any standard UK size. Combined with pocket springs that respond to each sleeper separately, that means a partner shifting position is far less likely to wake you than on a narrower mattress.
Is a super king pocket spring mattress good for a restless partner?
Yes, and it is arguably the strongest case for this size. Pocket springs compress individually, so movement doesn't travel across the surface the way it does on a connected coil unit. Add 90cm of width each and a fidgety sleeper becomes easy to ignore, which no comfort layer alone can achieve.
Should I get the Ruby 12500 in a UK king or a UK super king?
The UK super king is 30cm wider than the UK king, and the two are the same length. If your room meets the 3m x 2.9m we suggest as a minimum, and you share with a restless partner, children or pets, the extra width is the better buy. In a tighter room, the UK king is the sensible choice.
Does the Ruby 12500 feel any different in the super king size?
The firm feel and pocket spring build are the same in every size, so the mattress itself won't feel softer or firmer. What changes is how you experience sharing it: with 90cm each, you sleep further from your partner's movements, which many couples read as a calmer, more settled night.
Is the Ruby 12500 super king suitable for sharing with children or pets?
It suits that situation well. The 180 x 200cm surface absorbs an extra small body or a large dog without pushing either adult to the edge, and the firm pocket spring construction keeps the surface stable under uneven weight. Lightweight children lying on their sides may find the firm feel less forgiving, but for occasional visits that rarely matters.