Don’t get cold feet. Powered by batteries, these socks have built-in heating panels near the toes for more warmth than disposable foot warmers. Just hit the power button on the battery packs to get the heat flowing. Each sock has a pocket on the cuff for storing the packs securely out of your work boots and within reach. While these socks are slim for a comfortable fit in your boots, they’re far from flimsy: made of a wool blend, they’re more wear resistant than cotton socks. Hand wash or machine wash them on the gentle cycle using the included mesh bag. Hang-dry only. Batteries not included.