100% Lyocell Jersey Knit With HeiQ Cooling Technology for Maximum Protection Waterproof Protector Machine Washable Protects Mattress and Reduces Allergens. 100% Waterproof - Six-sided zipperedd premium mattress protector with cooling, blocks sweat, bed wetting and liquid spills. Keeps your mattress safe - Blocks dirt, dust and dander Bed Bug Proof - Completly seals off the mattress from bedbugs The Igloo Total Encasement Mattress Protector is a sure way to protect your mattress from all the elements and accidents a mattress could have. It is waterproof, noise-free, and does not compromise your mattress feel. Our soft lyocell jersey knit includes HeiQ Cool Dual Action Cooling Technology to help you sleep 5 degrees cooler throughout the night. This proven technology is used worldwide and is the world's first textile technology to deliver instant contact and continuous evaporative cooling for optimal comfort day or night.