Enjoy a cooler, dryer sleep environment with the Encase® Omniphase® Mattress Protector with Tencel® fabric. Laboratory certification ensures complete encasement protection from the patented H2Pro® membrane, which allows air to pass while blocking out bed bugs, dust mites, fluids and allergens. This quiet, cool mattress protector features Omniphase® phase change material. It captures, stores and releases body heat to keep a comfortable temperature. Tencel® fibers offer a soft, silky touch and superior moisture-wicking abilities. This zippered protector covers all six sides of your mattress and has a Universal Fit® design to fit snugly against mattresses up to 22 inches thick without shifting or bunching.