Added flexibility for the Hotronic heat system, or for people with custom fit boots who want as little between their foot and the boot liner as possible, the Hotronic Heat Socks Surround Thin provides graduated compression, a thin construction, anatomical fit features, and a Surround Heating Element to wrap your toes in toasty comfort. It’s a low volume, high-performance sock that offers moisture wicking performance and warms both the top and bottom of toes so you maintain the fit of your ski boots, and enjoy the comfort of toasty toes even in those performance fit boots. Adding a pair of these to your quiver gives you the fit and feel you want in your ski boots and lets you use your comfort fit pair for your hikers, winter boots, and more sedentary winter activities. Or pair these with the high capacity XLP 2P BT battery for 18 hours of heat, or, if you don’t need that level of capacity, the XLP 1P BT with its 10 hours of continuous performance. For the skier who knows exactly what they want in their boots: a combination of smooth fit and toasty toes, the Surround Thin dials it in to precisely provide performance along with enveloping heat around your toes.