i play swim shoes series are made from breathable, absorbent materials, without the use of harsh chemicals to ensure baby's comfort. Water-friendly shoes with no-slip soles for traction protecting feet from rocks and rough surfaces. Stretchy pull-on closure. Hand washable. Made from 82% Neoprene, 10% Rubber and 8% Nylon. The i play water swim shoes enables you to give the baby, infant or toddler the best in protection and comfortablity. As with all shoes please use caution when walking on wet and slippery surfaces.