Santoprene would technically fall under plastic extrusion, but is a common alternative for rubber based on some of its properties, including the ability to color the material more easily, and in move variations, than most rubber compounds. Santoprene is one of the most popular brands in the TPR (thermo-plastic rubber) and TPE (thermoplastic elastomer) catagories. Thermoprene exudes dozens of materials in these catagories, which can include dramatic options in durometer, elongation, transluscent color, etc. Thermoprene offers commercial sewing services, which although unusual in profile extrusion, you can see how we have attached the Velcro (hook and loop) material to the profile flange.