- Size: 39 • Includes 2 pairs of thermal insoles made of lambswool to keep feet warm during winter. • Made with 100% natural materials: lambswool and natural latex, offering an extra thick and cozy experience. • Ideal for any type of footwear: sneakers, winter boots, rain boots, leather shoes, and work shoes. • Non-slip design thanks to the natural latex foam, ensuring the insoles stay in place. • Provide a pleasant temperature for the feet, avoiding cold and excessive heat. • Easy to adjust: simply trim the insoles to the desired size if you are between two sizes.