Thermic Heated Sock Fusion ONE Set - S-Pack 2400

The Thermic Heated Sock Fusion ONE Set pairs heated socks with the S-Pack 2400 battery, sold as a complete system rather than as components to assemble. Heated socks address a specific problem that thicker socks make worse: cold toes in ski boots usually come from restricted circulation, and adding sock thickness tightens the fit and restricts circulation further. Applying heat directly to the toe box works where insulation does not. The battery clips at the cuff and runs multiple output levels, so a mild day can run low and stretch the runtime. Charge fully before a cold day. Fit the boot with these socks on, not with a regular sock. Unisex.