The Five-Sided Mattress Protector with Tencel & Omniphase is the most advanced mattress protector on the market with three incorporated technologies — Tencel, Omniphase, and the H2Pro membrane. Omniphase phase-change material promotes a comfortable sleeping temperature in any climate; Tencel fiber wicks away moisture from the body and the laboratory-certified H2Pro liquid-proof membrane creates a quiet, and breathable barrier against allergens and dust mites. The combined benefits of these technologies means you will sleep comfortably and dry with five sides (top and sides) of protection for your mattress. Pillow protectors are also available to create a healthy sleeping environment.