Full Hypoallergenic Bed Bug Mattress Cover with Auto-Locking Micro-Zipper Enclosure Polyester Completely waterproof and noise-free Breathable fabric allows air circulation but prevents liquids from passing through 82% Polyester Tricot supersoft fabric & 18% TPU Thermoplastic polyurethane (TPU) has many useful properties, including being water proof, good elasticity, has a resistance to oil, grease and abrasion. Fits Full Mattresses  54" x 75"