Designed for enhanced comfort in winter boots, the Sidas 3Feet US Winter Low is one of our favorite insoles to upgrade our boots with. Featuring a low arch design and maximum cushioning for soft and comfortable support, the 3Feet US Winter Low is perfect for hiking and mountaineering boots. The synthetic top cover is layered overcushioning foam and has an insulating aluminum lining for the best combination of warmth and comfort. The optimized pressure distribution of the anatomical construction is ideal for feet with a low arch.