Worn gently for 2 months. My kids grew out of them so fast. Stiff hiking boot feel. My kids loved these! Watch them fly over trails in the waterproof/breathable REI Co-op Flash kids' hiking boots. REI-exclusive technologies create fast-and-light boots—with a lighter footprint and comfy that won't quit. WATERPROOF Yes UPPER 99% recycled PET polyester FirmaKnit; 30% recycled thermoplastic urethane (TPU) overlay