Synthetic-and-mesh PGuard Toe Protector - Enhanced toe durability. Seamless Construction - The use of seamless materials reduces the potential for irritation and friction caused by traditional stitches and seams. 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. Trusstic System technology - Reduces the weight of the sole unit while retaining the structural integrity of the shoe.