Rearfoot and forefoot GEL Cushioning Systems. Attenuates shock during impact and toe-off phases and allows movement in multiple planes as the foot transistions through the gait cycle... Removeable sockliner... AHAR+ - lightweight high abrassion resistant rubber placed on heavy contact areas of outsole to reduce wear... California Slip Lasting - for stability and comfort... Trusstic System - Reduces the weight of the sole unit while retaining the structural integrity of the shoe...