The Only Rechargeable Heated Insoles.

Unlike typical heated insoles that require clunky external battery packs and wires, these cordless insoles have embedded rechargeable batteries that deliver enough heat to keep feet at a comfortable 98.6° F for up to eight hours of skiing, sledding, or snowshoeing. The wafer-thin lithium-ion cells are virtually undetectable and can be recharged up to 500 times with no creation of battery "memory," ensuring a consistently lengthy operation with each use (requires eight-hour charge from AC adapter). The insole's six-layer design includes a shock-absorbing, ergonomic polyurethane base, while a layer of heat-retaining synthetic material staves off frigid temperatures. Carrying pouch holds insoles and lightweight recharging adapter. Plugs into AC. Sizes S (Men's 4 1/2-5 1/2; Women's 6-7), M (Men's 6-7; Women's 7 1/2-8 1/2), L (Men's 7 1/2-8 1/2; Women's 9-10), or XL (Men's 9-10 1/2 ; Women's 10 1/2-12). (1 lb.)