Thermic Heat Kits are ideal for skiers and riders who purchase C-Pack batteries independently, require replacement parts, or regularly swap batteries between several pairs of boots. The Thermic Heat Kit Topcover is adhesive, providing extra comfort and a smooth finish. Custom 3Feet and 3D insoles (1 pair) come in one size, easily fitting any boot size after trimming. The Heat Kit is compatible with a C-Pack battery range from Therm-ic.