Tebery memory foam bed bumpers were designed to keep your child safety sleep in their bed. The semi-circle pillow pads are made of non-toxic foam with a water resistant cover and a non-slip bottom to keep them in place. The cover can be removed and is washable. Also, they are foldable and ultra-light for travel. Easy to install: -First, open the vacuum package to allow the foam to rebound to its original shape. -Second, place it on the mattress. -Third, cover the fitted sheet.