Astral Rassler Water Shoe Minimalist construction lightens weight, improves foothold, and greatly reduces the need for toxic adhesives in construction Durable Cordura Upper is both durable and lightweight Breathable Airmesh vamp & tongue Drainage at front sidewall and Silt Dump at heel lets water and debris quickly drain out but it is high enough to keep puddle water from coming in. Natural Balance Midsole (zero drop) places heel and ball of foot on same level for the best balance in unpredictable terrain