Who the Comfort Ortho Firm suits
This is the best support-per-pound mattress we list. An 8.6 support score at £157 is not something we expected to be writing, and it comes from a straightforward decision: build the mattress around reflex foam rather than memory foam, and let it be genuinely firm instead of hedging.
It suits front sleepers, back sleepers, and people who have been told to sleep on a firmer surface. It does not suit dedicated side sleepers, who need the shoulder to sink further than this mattress will allow, or anyone who finds firm mattresses uncomfortable. Our orthopaedic mattress guide and firm vs soft comparison are worth reading before you commit, because the absence of a trial period means this decision is final.
Construction and materials
A 20cm build combining reflex foam with a memory foam layer, under a removable zip cover. Reflex foam is a high-density polyurethane that pushes back rather than contours – it is the material orthopaedic mattresses are built from, and it behaves quite differently from memory foam under load. The thin memory foam layer takes the hard edge off the surface without compromising the support beneath.
The removable, washable zip cover deserves a mention because it is genuinely uncommon below £200. For anyone dealing with allergies, children, or simple wear, being able to strip and wash the cover extends the mattress's usable life – see our allergy mattress guide.
Comfort and support
We score it 8.6 for support and 7.9 for comfort, and that gap is the whole character of the mattress. On your back, the reflex core holds the pelvis level and keeps the lumbar spine neutral – precisely what the clinical literature associates with reduced back pain. On your front, it prevents the hip-drop that causes lower-back strain on softer beds.
On your side, it is too firm for most people. The shoulder does not sink enough, the spine bends laterally, and you will feel pressure at the shoulder and hip. That is not a flaw, it is the mattress doing its job for a different sleeper. If you sleep on your side, buy the Saffron Comfort Deep instead.
Temperature
Reflex foam is denser than memory foam and there is no cooling technology here, so this is not a cool-sleeping mattress. On the other hand, firm mattresses trap less heat than soft ones for a simple reason: you sit on top of the surface rather than sinking into it, so less of your body is enveloped. In practice it runs about average for an all-foam build.
Edge support and motion isolation
Edge support is better than the softer mattresses in this range, because firm foam resists compression at the perimeter as well as in the middle. Motion isolation is only moderate – reflex foam transmits movement more than memory foam does, so a restless partner is more noticeable here than on the Core Bubble Memory.
Durability, trial and warranty
High-density reflex foam is among the more durable materials at this price point; it resists permanent compression better than lower-density comfort foams. Five-year warranty, no home trial. Expect 5–7 years of nightly use, at the upper end for a budget mattress. The washable cover helps keep it hygienic across that span.
Our verdict
The Comfort Ortho Firm is the standout value buy on this site for anyone who needs a firm, supportive surface. An 8.6 support score for £157, with a washable zip cover and UK manufacture, is exceptional. The caveats are real and you should weigh them honestly: it is firm, side sleepers will not enjoy it, and with no trial period you cannot change your mind. If you already know you sleep better on a firm mattress, buy it without hesitation.
