The set includes one base mat with a PVC waterproof back that can be wipe cleaned, along with three changeable top mats. The top mats can be changed, washed and then re-used. Velcro patches allow for a quick and easy change of the top mat, keeping diaper changing as neat, clean and hygienic as possible. The changing mat is ideal for providing a warm, comfortable surface for your baby while changing him/her. Made in 100% cotton, the mats are soft and gentle on your baby’s skin.