The TerraTherm heat insoles provide a reliable solution for cold feet. They keep warm for up to 8 hours and are perfect for all types of outdoor activities, winter sports, or walks in cold temperatures. The insoles reach an average temperature of 39°C. They are made from natural ingredients such as iron powder, salt, and activated charcoal, and they heat up automatically when exposed to air. Thanks to their ultra-thin and flexible design, they easily fit various types of shoes, whether winter boots or sports shoes. This set includes 5 pairs of heat insoles in shoe size XL (44-46). The insoles are easy to use: simply place them in your shoes after unpacking and enjoy the comforting warmth. Ideal for anyone who wants to keep their feet warm even in cold temperatures.