The Encase Omniphase mattress protector delivers six-sided protection and a cool, dry sleep environment. Patented and lab-certified technologies completely block bed bugs, liquids, allergens and dust mites. Omniphase phase changing fabric absorbs and releases heat to create a cooler sleep surface, while Tencel fibers wick away moisture. Universal Fit design ensures a secure fit on 6" to 22" thick mattresses.