Yaktrax Thermal Insoles provide an easy and effective solution for people with cold feet. With a Radiantex layer that reflects warmth back to your feet and polar felt to trap the heat, these insoles are sure to keep your feet toasty. Radiantex layer redirects heat back to feet and keeps moisture out. Blended polar felt traps in heat. Sold as one size, trim to fit. Heat rated to -13degF. | Yaktrax Thermal Insoles, Various Patterns