a soft thermoformable elastomer with a phase change material exhibiting high latent heat of fusion . the compound provides elasticity , softness , formability , and heat over an extended duration and to facilitate prolonged skin contact at elevated temperatures . used in combination with active ingredients the increased temperature and formability provides enhanced transdermal delivery through the skin . thermoplastic elastomers may be manufactured by mixing together plasticizing oil , a triblock copolymer , a paraffinic substance and one or more additives , e . g ., an antioxidant , an antimicrobial agent , and / or other additives to form a mixture which melted then cooled into the thermoplastic elastomer . during cooling , the thermoplastic elastomer may be molded or otherwise formed into any number of articles including , but not limited to , prosthetic liners , prosthetic sleeves , external breast prostheses , breast enhancement bladders , masks , wound dressing sheets , wound dressing pads , socks , gloves , malleolus pads , metatarsal pads , shoe insoles , urinary catheters , vascular catheters , and balloons for medical catheters both vascular as well as urinary . active ingredients are preferably added to the cooling thermoplastic elastomer when the temperature is below 100 ° f . to prevent heat degradation and / or breakdown of vital proteins .