1 Pair of ultra-thin replacement heat elements and stick-on easy-to-trim cambrelle top; Replacement heat elements diffusing constant heat for immediate well-being and an optimal foot temperature; Stick-on Therm-ic topcover for added comfort and refinish Custom, 3Feet and 3D insoles (1 pair); One size, easy to trim to fit your foot; Suitable for use with Therm-ic C-Pack battery range only; Slips easily into snow and ski boots; Ultra-fine heating elements diffuse constant heat for immediate well-being and an optimal foot temperature