Allerzip smooth mattress encasement provides total mattress protection. It is stain proof, waterproof and prohibits the growth of bacteria. It is also bed bug entry and escape proof. Zip links are available. Fitting: Mattress encasement. Cover: 100% polyester. Waterproof Miracle Membrane on all six sides. Allergen barrier on all six sides. Test washed 200 times. Colour coded side labels. Double stitched commercial grade French seams. Three sided micro zipper and allergen flap. The benefits of Allerzip Smooth: Keeps Human body fluids out. Prevents growth of bacteria in the mattress. Keeps dead skin cells out. No stains on any surface. 100% bed bug entry, escape and bite proof early detection, reduces bed bug inspection time. AAFA certified. No human smells in mattress fibres. Extends the life of the mattress by an average of 3 years. With good care the product should last 5 years. Easy care. Wash hot. Tumble dry.