Sleeping hot and protecting a mattress should not be a trade-off. The back of this cover is made of top-grade TPU, an invisible waterproof barrier that repels dirt and all liquids — accidental spills, sweat and urine alike — so the mattress underneath stays clean and dry. It is certified to Standard 100 by OEKO-TEX, with no harmful chemicals or odor to worry about. The surface blends 65% polyester with 35% viscose derived from bamboo, engineered to be more breathable and softer than cotton terry, pure polyester or common rayon covers. Its 3D Air filling is perforated with ultra-fine ventilation holes that allow airflow while locking in moisture and accelerating evaporation, and it stays silent — no crinkling, no plastic sound — as you move. The fitted-sheet style skirt is highly elastic mesh, fitting mattresses 8″ to 21″ thick, including memory foam, latex and spring beds, without shifting. Machine wash cold separately on a gentle cycle, tumble dry low; no bleach or dry clean.