Transform any pair of insoles into cozy heat-holding allies with the Heat Kit—ultra-thin heating elements and soft, self-adhesive covers that tuck invisibly under your feet. Wet trails, icy chairlifts, or cold commutes? Keep warmth right where you need it, beneath every step. Set out on winter adventures with confidence—no more frozen toes slowing you down. The Heat Kit integrates sleek, ultra-thin heating elements beneath your insoles, delivering consistent warmth across your soles without compromising boot fit or foot feel. A self-adhesive textile cover ensures comfort, while making installation and trimming a breeze. Specifications: Kit Includes: 2 ultra-thin heating elements 2 self-adhesive textile (Cambrelle) top covers Compatibility & Power: Fits all types of insoles, as well as trainers and everyday shoes Works exclusively with Therm‑ic C-Pack batteries (NOT included)—add warmth by pairing with your existing power or choose a C-Pack for full kit compatibility Design & Installation: Ultra-thin elements—designed for seamless integration Self-adhesive covers—for comfort and easy trimming to insole shape Durability & Fit: Durable enough for repeated use across footwear types Ideal for those swapping heat elements between skis, boards, or boots Whether you're patching together gear for multi-day backcountry missions or simply want extra warmth on your daily walk, this kit fits all insoles, trainers, or street shoes. It’s compatible with Therm‑ic’s C-Pack battery range (sold separately), letting you mix, match, and warm multiple footwear options—all with the same power source.