• Warm and cozy insoles: made of high-quality synthetic wool material with a thickness of 15 mm. • Soft and comfortable, they offer warmth in the cold winter. • Humanized design: cut to the shape of the human foot, providing the best cushion and preventing injuries. • Non-slip: hand-sewn wool felt bottom layer for better air circulation. • Binding seam design: thick and fluffy fleece lining, they do not flatten with use. • Thick and warm replacement insoles: ideal for boots, slippers, work boots, hiking boots, rain boots, sports shoes, and sneakers. • Washable and reusable.