The pop-in swim nappy is made of a special laminate which is softer and more flexible than traditional neoprene and contains three layers - inside, a fast wicking fleece, outside, a stain resistant water repellent layer and between the two lies a hidden waterproof membrane. This special material coupled with our unique seal to skin; binding at the legs and waist means you can be sure our Pop-in swim nappy will keep any little accidents safely contained in their swimmers.