These woolen heated sock liners are individually controlled on each lower leg via a soft silicon 4 level back-lit heat level control button on the rechargeable battery leg wrap that is detachably connected to the sock via a curly cord and mini-plug.

Soft, quick-drying stretch wool; Mid-calf height sock.

Heats under the pad of your foot with 4 heat levels including pre-heat.

How it works. Using new ActiVHeat heating technology that uses very thin carbon microfiber bundles to conduct heat and powered by compact rechargeable lithium polymer batteries for each foot, our ActiVHeat heated sock liners reliably warm your feet for up to six hours of constant heating time, may stimulate blood circulation & can easily fit in all shoes, providing adjustable warmth on demand. The  battery pack wraps  can be removed to wash the sock liners. The liners are both washable and flexible while at the same time soft to the touch.

Why a sock liner vs. a sock? Worn as a base sock layer next to the skin and made from soft wool, these sock liners protect your feet from blisters, abrasions, and add additional cushioning to your footwear. They can also be worn as an ultra-light sock on warmer days without the battery packs attached.

Flexibility. Different activities require different socks. These battery heated sock liners can be matched with different outer socks to suit your varied activities. And you still get to wear your favorite ski socks, work socks, hiking socks, riding socks, and/or biking socks! In addition to the flexibility of use that a sock liner provides, they move moisture faster away from your feet and keep your feet drier than using non-liner socks alone.

Moisture Management. To stay warm, your feet need to be dry - this means always using a wicking material next to the skin. While many socks have good wicking properties, often the best solution is to use a liner sock in conjunction with a medium or heavyweight sock to keep moisture away from your feet.

Why wool? The natural advantage - wool stays warm when damp. Wool works with your skin, to create breathable, moisture wicking sock liners that pulls perspiration away from your skin, helping you stay dry and comfortable. Wool socks keep feet drier because wool absorbs as much as 30% of its own weight before it begins to feel damp. Wool moves moisture away naturally.

Every wool fiber is made up of millions of springy coils that stretch during use but spring back to their original positions when you take off the sock liner. Wool also features inherent qualities such as wrinkle resistance, colorfastness, and it breathes with your body. In addition, wool has natural anti-odor and anti-bacterial properties for maximum performance under any condition.