Soft & Skin-Friendly Fabric The premium cover adopts different exquisite designs on both sides to meet your different sleep needs. 4 Elastics keeps topper in place Elastics of 4 corners have excellent elasticity to fit mattress height of 2 to 21 inches Machine-Washable Cover The cover is easy to remove and clean. Every time after washing, it still looks like new. Open-Cell Technology Ventilated holes increase air flow and help dissipate excess heat from sleep. 5 Seconds Slow Rebound Slow rebound high-density memory foam fits your body curve more closely to help relieve pressure. Cover with Smooth Zipper The user-friendly orange zipper reflects the full vitality and chic.