Red Wing Shaped Comfort Footbed provides a layer of lightweight cushioning, ensuring the perfect fit when paired with all footwear from the Red Wing heritage range. Features include PORON® to absorb shock from impact and a suede fabric covering to assist with moisture management. M = US 7-8.5 UK 6-7.5 L = US 9 -10.5 UK 8-9.5 XL = US 11-13 UK 10-12