Cold feet spoiling your winter? The Heat Sock Set XLP 2P BT Surround Comfort is the absolute best when it comes to combining flexibility, warmth, and longevity into a foot heating system. Socks.. these are socks.. so they can go into any of your winter boots, from your hikers to your ski boots, and even into bike shoes to extend your biking season. This complete kit combines a pair of HOTRONIC XLP 2P BT Battery Packs with the Soft Compression and Surround Heating Element in a Surround Comfort sock. The battery has Bluetooth, so you can control the heat settings, keep abreast of the battery power, and set your elements to stand-by mode when you’re in the lodge for coffee. The socks’ Surround Heating Element envelopes your tender toes with constant heat. The batteries ride on the sock cuff, with power wires positioned along the lower leg and wrapping ergonomically around the Achilles and under the arch before delivering heat to the top and bottom of your toes. The XLP socks feature a graduated compression for fit, warmth and recovery, in a wool blend with a cushioned fit. The battery pack XLP P is the next level of lithium-ion constant heating power with the best size-to-capacity ratio, and longevity, on the market, a full 18 hours of capacity! When you’re going to be out there for hours, or want to run your socks hot, these are the socks to choose!