Foam with density 20,5-22,5 kg/m3. Hardness 120N (+/- 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 50 kg. Mattress is without the cover, it can be purchased separately! Picture is illustrative!