Encase® Omniphase® Mattress Protector Split Queen 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. L : 20.5 - W : 20.5 - H : 16.5 - W : 45