No more cold feet with the sole warmers from Thermopad. Thermopad sole warmers can be removed from the packaging and simply placed in the shoe like an insole. The sole warmers automatically activate after contact with oxygen and deliver up to 8 hours of warmth. Who hasn't had this happen to them before? Great skiing weather, pristine slopes after days of snow - and freezing, bone-chilling cold. Our sole warmers fit into any ski boot and provide you with pleasant warm feet, even during ice cold outside temperatures. The sole warmers are available in three different sizes: S (4-6), L (7-8), XL (9-11) and are a disposable item that can be disposed of as non-recyclable waste. Substance of contents: Iron powder, salt, activated carbon, water and vermiculiteSystem Requirementsautumn/winter 2014Box Contains1