Parachute nylon fabric weighs little, dries in a snap, and sheds dirt and sand?just shake it off, and it?s clean * Large size is ample space for the family or friends to stretch out * Pockets at the corners can be filled with sand so the sheet won?t blow away in the breeze * Sheet packs compactly into its built-in stuff sack * Sheet is machine-washable and air-dries quickly, plus it?s mildew-resistant