1. Simply open the package, and the warm insoles will start heating up in a few minutes upon exposure to oxygen.
2. Peel off the film from the heating pads and attach them to either the top or bottom of your socks.
【Heat duration】Up to 10 hours of lasting warm soles with an average temperature of 102°F. No electricity, boiling or additional heating of foot warmers required
【Comfort】The ultra-thin and comfortable toe warmers are barely noticeable and fit any shoe bed - whether it's a ski boot, winter boot or an elegant ladies’ shoe
【When to use】The shoe warmers are ideal for outdoor activities, winter sports of all kinds, winter walks and visits to the stadium and the Christmas market. Can be kept for several years unopened
【Natural material】The sole warmers consist of iron powder, water, salt, activated carbon and vermiculite. Heated insoles are the perfect product for warm feet for children, women and men