ASICS Men's GEL-Equation 3 Running Shoe 100% Synthetic leather and synthetic fiber Rubber sole AHAR heel plug enhances durability at initial impact GEL Cushioning System attenuates shock during impact phase Trusstic System links the rearfoot and forefoot and shores the midfoot Rearfoot GEL Cushioning System provides shock attenuation in the heel Slip-lasted for flexibility and lightweight comfort