TerraTherm Insole Foot Warmers - Air Activated - 8 hours of warm feet

HEAT TIME: 8 hours foot warmer insoles with an average temperature of 39°C. No electricity, boiling or additional warming necessary for the foot heat pads.
COMFORT: The ultra-thin and comfortable warm insoles 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.
MINERAL- AND ACTIVATED-CARBON-BASED: The thermal soles consist of iron powder, water, salt, activated carbon and vermiculite. Heated insoles are the perfect product for warm feet for children, women, and men!
APPLICATION: After opening the package, insole warmers heat up after contact with oxygen within a few minutes. Insert heat warmers into the shoes with the smooth side down, and enjoy the warmth.
AREA OF USE: Heat 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.