The Five 5ided® 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 of protection for your mattress.