These inserts heat up on their own and are thin enough for regular shoes or ski boots. You charge them over USB. They are made for the moments when you stand in the cold for a long time.

Thick socks only keep you warm while you keep moving. On a chairlift or along the sideline, insulation alone stops working because nothing is producing heat anymore.
The heat stays inside your shoe, where you need it.

Charge them before you leave, then place them under your usual insole or in place of it. The control sits on a short cable near the ankle. After use, let them air-dry before you put them away.
Plug them in the night before your next day on the mountain.
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