Polyvinyl Chloride sole EXTRA WATERPROOF: The sturdy rubber sole and the elastic band keep your children?s feet dry and comfy for a long time out. EASY CLEANING: Clean or dry these rain boots with a cloth or running water, the smooth surface makes a wipe down effortless. FLEXIBLE & LIGHT: Made of lightweight plastic PVC, extra flexible. SNUGLY & SECURE: Specially aligned and fitted most kids' feet shapes. DURABLE: Thick rubber and solid joints make glue opening very unlikely. Daily motions will not cause structure damages.