HOKA ONE ONE Men's Stinson 3 ATR fabric-and-synthetic Rubber sole Engineered midsole volume which is up to 2.5X the volume than standard running shoes, made with performance-specific cushioning material. Meta-Rocker midsole geometry, specifically engineered with a low heel-toe differential and a sculpted outsole radius in the heel and toe, creates a unique fulcrum effect and encourages a guided foot gait cycle. Uniquely engineered Active Foot Frame midsole geometry allows the foot to sink deeply into the shoes midsole.