100 Percent cotton mesh mattress protector with anti-lint treatment to keep its softness during washing This fully breathable mattress protector is waterproof at the upper part thanks to its smartseal membrane It fits perfectly on mattresses up to 32 cm high thanks to its elastic cap This mattress protector covers 5 sides of the mattress It is thus ideal if the base of the bed is a safe bed, since dust cannot penetrate from the bottom This mattress protector is manufactured without the use of harmful substances, as guaranteed by OEKO-TEX certification (20120k0516-AITEX)