Synthetic Imported Rubber sole Shaft measures approximately low-top from arch Rearfoot GEL? Cushioning System: Attenuates shock during impact phase and allows for a smooth transition to midstance. Elastic Laces: A classic triathlon feature allowing a runner to put the shoe on quickly, easily, and securely. Hook and Loop Fastener: Easy on and off. Trusstic System? Technology: Reduces the weight of the sole unit while retaining the structural integrity of the shoe.