Harrison Spinks Ruby 12500 Pocket Mattress (Soft to Medium Feel)
Mattress
Harrison Spinks Ruby 12500 Pocket Mattress (Soft to Medium Feel)
Size
Firmness
Medium Soft
Construction
Depth (cm)
29
Layers
6
Layer Details
- Damask cover. A damask cover that's soft to the touch. It's the traditional choice for a handcrafted mattress and feels pleasingly plush under a sheet.
- Wool comfort layer. Layers of British wool blended with hemp and flax fibres sit directly beneath the cover. Wool regulates temperature naturally, which means it helps you stay warm in winter and cooler in summer.
- Cotton, hemp and flax blend. A cotton, hemp and flax blend is layered throughout the mattress. These natural fibres add breathability and a slightly springy, resilient comfort that foam can't quite match.
- Cortec Quad springs. 700 Cortec Quad springs, with groups of four springs placed within a single fabric pocket. More springs per pocket means finer, more localised support as you change position.
- Posturfil springs. 1800 mini Posturfil springs designed with flexibility in mind, adapting with your body as you move through the night. In practice that means less resistance when you roll over.
- Mini springs. 10000 bouncy mini springs create pockets of airflow throughout the mattress. That built-in ventilation helps keep the natural fillings fresh over time and adds a little extra cushioning.
Layer details from mattressonline.co.uk product page, September 2026.
- 90cm each, every night: Two people sharing get 90cm each, which means a partner who turns often through the night becomes far easier to sleep beside.
- Distance beats any comfort layer: A pocket spring design already limits motion transfer, but on a soft to medium surface, sheer width does more to protect your sleep than any spring count.
- Room for night-time visitors: When a child pads in at 3am, or a large dog treats the bed as theirs, 180cm of width means everyone still gets a workable share.
- Natural fillings across a bigger surface: Wool, hemp, flax and cotton breathe well, and at this size two sleepers each get their own cooler patch rather than sharing one.
- 30cm wider than the UK king: The UK super king is 30cm wider than the UK king and the same length, so the upgrade is all sleeping width, none of it wasted.
- Compare live prices: This is a premium mattress in its largest size, so compare the retailers listed on this page, as the prices shown are updated when retailers change them.
This size suits you if...
You share the bed every night and want the most sleeping space a standard UK size offers, your partner moves a lot and you feel every turn on your current mattress, or children or pets regularly join you and a UK king has started to feel crowded. It also suits a large master bedroom or period property where a smaller bed looks lost against the wall.
Consider another size if...
Your bedroom is smaller than our suggested minimum of 3m x 2.9m, or you sleep alone and the width would go unused. We'd recommend the UK king instead, which is 30cm narrower, the same length, and needs a room of at least 2.7m x 2.9m.
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Is the Ruby 12500 super king a good choice for a restless partner?
Yes, arguably the best in the range for it. The pocket springs respond locally rather than rocking the whole surface, and with 90cm each for two people sharing, most movement happens too far away to disturb you. On a soft to medium feel, that distance does more than any filling could.
What room size do I need for the Ruby 12500 in a UK super king?
We suggest at least 3m x 2.9m so you can walk round both sides and open drawers or wardrobes comfortably. Around 3.5m x 3.2m feels right. In a loft conversion, check the head height along each wall first, since the slope often decides where a bed this wide can actually sit.
Will the super king Ruby 12500 get up my stairs?
It needs care. This is a sprung mattress that shouldn't be folded, and 6ft x 6ft 6in is an awkward shape on a tight landing turn. Measure your stairwell, door swings and any turns before ordering, and check the retailer's access requirements. Harrison Spinks doesn't publish a weight for this mattress, so allow for two people carrying it.
Is the Harrison Spinks Ruby 12500 super king big enough for co-sleeping with children?
For occasional visitors, yes. At 180cm wide it's the same width as two UK singles side by side, so a small child slotting in between two adults still leaves everyone a reasonable share. The soft to medium feel cushions lighter bodies well, which makes it a popular landing spot.
Should I get the Ruby 12500 in a UK king or super king?
If your room meets our suggested 3m x 2.9m minimum and you share the bed, the UK super king is the better buy: it's 30cm wider than the UK king with no extra length to squeeze in. If the room is tighter, the UK king needs only 2.7m x 2.9m and still sleeps two comfortably.