Therm-ic C-Pack Set 1700 BT

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From Skis.com

The Therm-ic C-Pack 1700 BT is an excellent way for you to keep your feet warm for up to 17 hours on the slopes. This low-profile battery pack gives you the ability to control the heat settings via a Bluetooth connection or the single button control. Three different settings help you find the correct temperature and not only keep you comfortable, but improve your performance on the mountain. Included with this pack are the batteries, heating elements, cambrelle covers, and USB charger. The USB charger gives your batteries a short charging time so you are ready to get out for first chair in the morning.