The sole warmers fit into any shoe and provide pleasantly warm feet even in very cold outside temperatures. Thermopad sole warmers are manufactured to the highest quality standards and activate automatically after contact with oxygen. The warmers provide pleasant warmth for up to 8 hours. The warmers are particularly popular with rescue services, stadium visitors, winter sports, outdoor work, cold storage, hunting, forestry, fishing, camping or with children, for whom the hand warmers make it easier to get to school in icy temperatures. The hand warmers are comfortable, discreet and odourless. -Thermopad is made of a mixture of natural substances. -This mixture consists of iron powder, salt, activated carbon, water and clay mineral (vermiculite). -The substances are carefully mixed in the right proportions to produce granules that have the ability to react with oxygen. -A soft fleece that allows oxygen to enter, but not the powder to exit, makes the warmer what it is, a small, soft heat pad in various sizes and shapes. Thermopad warming pads are designed to generate heat for up to 12 hours after opening the airtight pouch, depending on the item. The reaction is based on the simple principle of chemical oxidation. Thermal energy, i.e. heat, is generated in combination with oxygen. The heat is generated naturally - without any environmentally harmful substances. Pleasant, light and always with you. First the hands and feet start to freeze and then the whole body. This is due to the fact that the body only starts to freeze at the outer extremities and thus the body's own protective function concentrates the main energy on the torso. This can be counteracted with Thermopads to have fun with sports even during longer stays in the cold, as well as to remain active and fully capable of concentration.