Features: Heat Time 10 hours of heat warmers with an average temperature of 48C. No electricity, boiling or additional warming necessary for the feet warmer. Universal FitThe ultra-thin and comfortable toes warmers are barely noticeable and suitable for every shoe bed no matter if it's a ski boot, a winter boot, or an elegant lady's shoe. Main MaterialThe foot warmers consist of iron powder, water, salt, activated carbon and vermiculite. Heat warmers are the perfect product for warm feet for children, women, and men! Easy To UseAfter opening the package, toe warmers heat up after contact with oxygen within a few minutes. Remove the foil from the heating pads and stick it to the top or bottom of your socks. Winter WarmFeet warmers are ideal for outdoor activities, winter sports of all kinds, winter walks as well as visits to the stadium and the Christmas market. Unopened, keepable for several years. Specifications: Type: A=Half Foot, B=Children EUR: 30-34, C=Women EUR: 35-37, D=Women EUR: 38-40, E=Men EUR: 41-44 Material: Non-Woven Fabrics, Iron Powder, Activated Carbon, Vermiculite Size: About A: (L*W): 9x7cm/3.54x2.76inch B Length: 18-21cm/7.09-8.27inch C Length: 22.5-23.5cm/8.86-9.25inch D Length: 24-25cm/9.45-9.84inch E Length: 25.5-27cm/10.04-10.63inch Package Included: 2pcs x Self Heating Insole Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 0.5-2 cm differences due to manual measurement.