Ship from Hongkong. Baby swim diaper is 2% of lycra and 98% of polyester fiber. It's waterproof and sift-proof. Swim diaper is no longer only preventing embarrassing accidents, also becomes the central of the health issue. Please choose the best fitness size for your baby accroding to your baby's weight (9-12kg). And the waistline is flexible. 8% lycra and 98% of polyester fiber. Waterproof and sift-proof. Choose the best fitness size accroding to your baby's weight. The waistline is flexible. Suit for babies.