100% Cotton Allersoft tm Full Mattress Protector 16 inch depth This revolutionary allergy encasement will help relieve symptoms of sinusitis,eczama, nasal drip associated to dust mites,pet dander, pollen and other allergens. Ultimate comfort with total breathabilty. Median pore side of 5 microns. Rust proof zippers. 100% Cotton. Machine wash warm tumble dry low.