evo.com | Therm-ic Boot Heaters > Bask in up to 17 hours of heated warmth with the Therm-ic C-Pack 1700 B Battery With a simple, single-button control and the ability to control heat levels directly from your smartphone, it's an easy solution for an age-old problem. We will warn you: once you go Therm-ic, you won't be able to live without it, so proceed to toastiness with caution. Compatible with Therm-ic InsolesHeat Flat, Heat 3D and Heat Kit Range Only Up to 17 Hours of Heat USB Charger Included Suitable To Use With Therm-ic C-Pack Battery Range Only Single Control Button | Therm-ic C-Pack 1700 B Battery 2026