bianca mattress protector is purely waterproof with breathable technology that allows air to circulate through the protector but repels liquids. prevents allergens like pollen or dust mites and bacteria to enter the mattress. it is ideal for use when putting infants to bed to protect your mattress against bed wetting. the mattress protector come with elastic edges in fitted pattern to accommodates any type of mattress, like memory foam, latex, or innerspring with 6 to 12 inch height. 36 x 76 in (L x W) dimensions : (L x W) : (S) : 75 x 36 inch | (L x W) : (M) : 75 x 48 inch | (L x W) : (L) : 75 x 60 inch | (L x W) : (XL) : 75 x 72 inch