The ENCASE mattress protector eliminates the passage of liquids to mattress. A lab certified protective membrane guards your mattress from liquids, stains, and dirt. The proprietary membrane allows air to pass for quiet and breathable comfort while blocking out the things you dont want on your mattress for peace of mind and a peaceful nights sleep. It is quiet, breathable, does not overheat and will not change the feel of your mattress. This protector fully encases the mattress to offer six sides of protection, guarding the top, bottom and sides of your mattress. A 360 degree zipper with MICROTITE technology keeps liquids out while allowing you to easily remove the top portion of the protector for laundering. Protector securely fits mattress depths from 6 to 14 inches. It has a full length elastic at the bottom to pull in excess fabric for a smooth, even fit. Includes two split size encasement protectors.