Vibram LiteBase outsole cuts weight by 30% over non-LiteBase outsoles. Dual BOA closure gives a precise fit with two distinct adjustment zones. Altra EGO™ MAX midsole offers maximum cushion and a bit more rebound to propel you with every stride. FootShape design allows your foot to sit more naturally in the shoe. Balanced Cushioning approach leads to a more natural gait through the zero drop platform.