The Epicstar INSOLE WARMERS S are your ideal companions for cold, wet, and frosty weather, keeping your feet warm and comfortable.. These insoles are crafted to be light and thin, yet they offer a delightful natural warmth that lasts up to 8 hours, keeping your feet cozy throughout the day. They are versatile and suitable for all types of shoes, including winter boots, mountain boots, work boots, biker boots, snowshoes and ski boots. At just 2 mm thick, these insoles maintain your walking comfort without adding bulk, ensuring a seamless fit in any shoe.