Patent ID: 7941883

Claim:
A mattress which in plan view comprises an inner portion and an outer portion, and the mattress being such that the inner portion is of a size for being slept on by at least one person, the outer portion extends at least partially around the inner portion, the inner portion is made of a foam material, the outer portion is made of a foam material, the inner portion has a plurality of apertures, the apertures are of a constant diameter, the apertures are spaced apart by a constant distance, and the apertures cause the inner portion to have a lower compression rate than the outer portion whereby the weight of the person on the inner portion is distributed over a greater area than would be the case if the inner portion had the same compression rate as the outer portion, and whereby the outer portion constrains the inner portion and controls lateral deformation of the inner portion caused by the weight of the person on the inner portion.