• Includes Two (2) custom ActiVHeat compact lithium rechargeable battery packs and silicon 4 level push button controller wrap, One (1) dual charger . These compact rechargeable battery packs are NOT compatible with our heated jackets, vests or black weightless glove liners. They ARE compatible with our cordless rechargeable heated glove liners; Also, includes 2 AA battery packs that use 3 disposable HIGH DRAIN  AA batteries (e.g. Energizer Lithium AA)  in each of the 2 battery packs (6 total - not included).
• These woolen heated sock liners are individually controlled on each lower leg.
• Uses 3 AA batteries (not included) per ankle/leg-mounted battery pack. Do NOT use NiMh or NiCd rechargeable batteries. You MAY use Nickel-Zinc rechargeable AA batteries. Not suitable for rechargeable NiCd or NiMh batteries. AA pack does not work well with regular low drain AA alkaline batteries like standard Energizer and Duracells. Works well with Energizer e2 AA lithium.
• Soft, quick-drying stretch wool; Mid-calf height
• 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 3 compact AA non-rechargeable 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 AA battery packs 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 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.

Sock Sizing Chart - Adult Shoe Size Reference

Sock Specifications: 61% Wool. Imported.