ASICS Men's Gel-Intensity 2 100% Synthetic and mesh Rubber sole Clutch Collar System A descendant of the Heel Clutching System, an Endoskelatal collar compliments the exoskelatal heel counter for a uniquely secure fit. Rearfoot and Forefoot GEL Cushioning Systems Attenuates shock during impact and toe-off phases, and allows movement in multiple planes as the foot transitions through the gait cycle. Trusstic System