6.1 Heat Sock

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Best Price: $209.95 

from:  backcountry.com

The Lenz 6. 1 Heat sock pretty much has it all-merino wool, a compression fit, and battery-powered heat for toasty toes under our ski boots. It's compatible with all types of Lenz lithium packs (not included), which can be attached to the socks with press studs on the waistband.

• Brand: Lenz
• Category: Clothing and Outerwear / Socks
• SKU: LENC00F-ONECOL-L