Encase® Omniphase® Pillow Protector King Pillow Protector The Encase® Omniphase® pillow 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. . L : 12.5 - W : 12.5 - H : 8.75 - W : 9.5