The Sareer Matrah Cool Blue Memory Coil Mattress in a Box is a guest-room or tight-budget mattress, and I wouldn't buy it for anyone's everyday bed. Under the cool blue memory foam is a Bonnell open coil, the linked spring unit I only accept on a budget or for occasional use. It's never a bed I'd put under a child.
Bonnell springs under a layer of memory foam
The core is a Bonnell open coil, springs joined together into one unit, under a layer of Sareer's Cool Blue memory foam and a stretch-knit cover. It's hand-tufted, one-sided, 22cm deep and arrives vacuum-packed. The listing says it has no extra edge support and is endorsed by the National Bed Federation.
Open coil passes movement across the bed and tends to dip where you lie most nights. That's why it suits a spare room, where it's slept on now and then. The memory foam softens the feel, though memory foam holds warmth whatever colour it's dyed. I hate being too hot, so I'd notice; if you run warm, you will too. Sareer's anti-microbial claims for the foam are its own. Air the room well for the first few days and wash the bedding often, which is what keeps a bed fresh.
Nearer medium than its label
It's sold as medium to firm, but owners put it softer than that, so I'd call it a medium. Several describe it as comfortable but not very supportive, one can feel the springs, and another found both edges collapse when sitting on them, which matches the lack of edge support. The happy owners mostly bought it for a spare room or a teenager. Avoid it for anyone who sits on the edge to dress, since one owner found the edges give way and nothing in the spec stops them.
Same money, pocket springs
For an everyday bed on a similar budget, the Sareer Matrah Reflex Plus Pocket 1000 swaps the open coil for pocket springs. For a guest room where it'll see a few nights a year, this is a fair choice.
