Crocs Women's Carlisa Leopard Flat 100% Synthetic Synthetic sole Heel measures approximately 0.25" TPU upper Croslite footbed with circulation nubs with circulation nubs Rearfoot and Forefoot GEL Cushioning System attenuates shock during impact and toe-off phases, and allows movement in multiple planes as the foot transitions through the gait cycle ComforDry Sockliner provides cushioning performance and anti-microbial properties for a cooler, drier, healthier environment, Solyte Midsole Material is a lighter weight midsole compound than ASICS? standard EVA and SpEVA NLOCK is an integrated lacing and webbing system that provides optimal fit, support and security