• Warm and cozy insoles: made of high-quality synthetic wool with a thickness of 15 mm, they offer warmth and comfort in winter. • Humanized design: cut to the shape of the human foot, they provide an ergonomic cushion that relieves pressure and pain. • Non-slip: hand-sewn wool felt bottom layer that improves air circulation and reduces sweating. • Binding stitching: thick and fluffy fleece lining with high-density felt insole, washable and reusable. • Thick and warm replacement: ideal for boots, slippers, work boots, and sports shoes. • Instructions: high and low arch, trim to fit, clean with a damp cloth. • Warning: not suitable for people with certain foot conditions.