Silicone is organic silicon resin rubber composite materials without stimulation to human body. Among the all insoles, silicone is the most expensive material. And the sales volume of genuine silicone is not big. So it will has many imitations, such as GEL, TPR, TPE. Silicone has excellent toughness and physical property is closed to human skin and muscle. So it is very comfort. Genuine silicone cannot composite with fabric and cannot stick on any material.