Surrounded by four high walls that work together with the built-in safety strap, Summer Infant's 4-Sided Changing Pad gives you the security of knowing that even though your baby is in constant motion, she can't wriggle her way off the changing table when you're reaching for another diaper. The waterproof pad is made of thick and comfortable foam covered in waterproof double-layered vinyl that's easy to clean and contains no PEVA, PVC, or phthalates. At 32"X16"X4", it's sized to fit any standard changer.