Relyon Ortho Superior Extra Firm 1500 Mattress
Mattress
Relyon Ortho Superior Extra Firm 1500 Mattress
Size
Firmness
Extra Firm
Construction
Depth (cm)
32
Layers
3
Layer Details
- Belgian Damask Viscose Sleep Surface. A silky, breathable damask cover that lets air move through the sleep surface. In practice, this means a fresher, less clammy feel through the night.
- Cotton. A natural filling that helps regulate body temperature, so you're less likely to wake up too warm. It also adds a layer of support and natural comfort above the springs.
- 1500 Pocket Springs. Each of the 1500 springs sits in its own fabric pocket, working independently of its neighbours. This means the mattress contours to your body and relieves pressure rather than moving as a single unit.
Layer details from mattressnextday.co.uk product page, September 2026.
- Space for two: You each get 67.5cm of width, which suits couples who settle and stay put, although restless sleepers may find they meet in the middle.
- Fits a typical bedroom: Allow at least 2.6m x 2.8m, which in many UK homes still leaves space for bedside tables on both sides, where a UK king would crowd them out.
- Less partner disturbance: The pocket springs each work independently, which means one of you turning over is less likely to jolt the other across a shared UK double.
- Cooler when sharing: Cotton fillings help regulate temperature, which helps when two people are generating heat in a UK double rather than one.
- Simple to dress: Standard double sheets fit, and a 200 x 200cm double duvet gives two people enough to share without a nightly tug of war.
This size suits you if...
You share with a partner who also sleeps on their back or front and wants a very firm feel, your bedroom is a typical size rather than a generous one, and you'd like room for a bedside table each without edging sideways past the bed.
Consider another size if...
You both sprawl at night and 67.5cm each already feels tight. We'd recommend the UK king instead; we suggest at least 2.7m x 2.9m for the UK king.
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Will the Relyon Ortho Superior Extra Firm in a UK double fit my bedroom?
We suggest a room of at least 2.6m x 2.8m for the UK double, and around 3m x 3m feels comfortable. That leaves space to walk round the bed and, in many rooms, fit a bedside table on each side. Measure wall to wall and account for wardrobes and radiators before you order.
Is the Relyon Ortho Superior double wide enough for a couple?
The UK double gives you 67.5cm each for two people sharing. That suits most couples who sleep fairly still. If either of you spreads out, the UK king gives 75cm each, so the UK double gives 7.5cm less per person. The independent pocket springs help limit how much you feel each other move.
Should couples size up to the Relyon Ortho Superior in a UK king?
The UK king is 15cm wider and 10cm longer than the UK double, giving 75cm each for two sharing. The trade-off is room space: we suggest at least 2.7m x 2.9m for the UK king. If your bedroom only just clears our UK double minimum, the smaller bed is the more comfortable fit.
Is a UK double Relyon Ortho Superior good for a guest room?
For visiting couples, the UK double offers enough width for a few nights and fits most spare rooms. The catch is the feel: this mattress is extra firm, so side sleepers among your guests, particularly lighter ones, may find it hard at the shoulder and hip. It suits guests who already prefer a firm bed.
Is the Relyon Ortho Superior UK double long enough if I'm tall?
The UK double is 190cm long (6ft 3in), the same length as the UK single and UK small double. If you or your partner are tall enough for feet to reach the edge, the UK king is 10cm longer than the UK double, though it needs more floor space.