Energy Of Nature Foot Warmer 2 Insoles Size 36-39

Self-heating foot warmers – a reliable and effective way to ensure comfort and protection against the cold in low-temperature conditions. They are also known as warm insoles, shoe warmers, foot warmers or heat insoles.
Key features of the hot water bottles:

• The heated insoles measure 25 cm.
• They heat up to between 40° and 55°
• They provide heat for up to 8 hours
• The pack contains 2 items (a pair)

How heat packs work – upon contact with air, an exothermic reaction takes place: the oxidation of iron powder, during which a large amount of heat is released.