Hotronic Heat Socks Set XLP 1P BT Surround Comfort Size:M The Armada Locator 88 Skis AL216 40 IN The Armada Locator 88 Skis are the slimmest offering in the Locator line up with 88 millimeters underfoot and the every practical I fit system Combining a pair of HOTRONIC XLP 1P BT Battery Packs with the Soft Compression and Surround Heating Element of the Surround Comfort sock the Hotronic Heat Socks Set XLP 1P BT Surround Comfort kit is everything you need to keep your toes warm packed neatly in a box The best size to capacity ratio on the market these batteries ride tucked into the cuff with power wires positioned along the lower leg and wrapping ergonomically around the Achilles and under the arch to deliver heat to the top and bottom of your toes