The Troll change mats have a removable cotton cover. The cotton fabric has been waterproofed and is machine washable on delicate cycle. The core is foam. Features: -Change mat to fit change tray for the Sun dresser-Waterproof-Distressed: No. Dimensions: -10.6cm H x 55cm W x 76cm D-Overall Height - Top to Bottom: 10.6-Overall Width - Side to Side: 55-Overall Depth - Front to Back: 76.