evo.com | Lenz Ski Socks > The Lenz rcB 2000 Lithium Battery Packs keep your toes warm for a whopping 22 hours with heat at your fingertips, thanks to nine adjustable levels on the Lenz app. Don't need yet another app? Toggle between three simple heat settings directly on the pack. Lithium packs are connected to the socks with snap fasteners. Small, Light & Compact USB Charging Cable Included Control with Smartphone App Heating output can be controlled with the free smartphone app (9 heating levels) or directly on the lithium pack (3 heating levels). 2 Lithium Pack rcB 1000 Rechargeable Batteries Provide up to 22 hours of heat at the touch of a button for work, sport and leisure. | Lenz rcB 2000 Lithium Battery Packs 2026 - OS Socks