Boot warmers are devices designed to heat up cold footwear, making them more comfortable to wear, especially in winter conditions. They can be electric or non-electric, with electric models often featuring adjustable temperature settings for personalized warmth. Non-electric options may use chemical heat packs or insulated storage to retain warmth. These devices are particularly popular among outdoor enthusiasts, such as skiers and hikers, who spend extended periods in cold environments. Boot warmers help prevent frostbite and improve overall foot comfort, enhancing the experience of outdoor activities during chilly weather.