A method of imparting a physiological cooling effect to a consumer product is disclosed. A method is provided to selectively cross-link the polymeric matrix comprising the medical device by employing an interrupting means such as a mask, wire mesh or chopper wheel placed in between the medical device and irradiation source. The pegs may be covered at least in part by a plastic tip or coating to provide a relative expansion capacity between the pegs and the refractory lining.