Rubber sole FLYTEFOAM Midsole Technology - Our FLYTEFOAM technology provides exceptional bounce back and responsiveness no matter the distance, utilizing organic super fibers to help reduce packing out that traditionally happens with softer, low density foams. Rearfoot and Forefoot GEL Technology Cushioning System - Attenuates shock during impact and toe-off phases, and allows movement in multiple planes as the foot transitions through the gait cycle. MONO-SOCK Technology Fit System - An elastic internal sleeve which replaces a traditional tongue providing a "sock-like" fit. Trusstic System technology - Reduces the weight of the sole unit while retaining the structural integrity of the shoe.