Product Description Thermal blend weather-strip, all climate, wave profile, thermal blend, 3/8 in width, 17 ft length, 3/8 in thickness, silicone/epdm, White, for sealing air and moisture leaks around doors and windows.. From the Manufacturer High performance Silicone/EPDM rubber blend provides a superior seal to block out drafts and dust around doors and windows. Stays durable and flexible in extremely cold and hot temperatures, down to -40°F and up to 140°F. Saves energy and money and year-round. Guaranteed flexible for the life of your home.