Foam with density 22,5-24,5 kg/m3. Hardness 145N (+/- 15%). Polyurethane mattress contour to the body exceptionally well thanks to low hysteresis and a reasonably good elasticity. Mattress works well for allergy sufferers. The product is suitable for maximum body weight 60 kg. Mattress is without the cover, it can be purchased separately! Picture is illustrative!