Each of these superb Trio Easy Fit Orthotic Insoles fits a size 9 to 10.5 shoe, supporting the medial side of the foot and the navicular to reduce stress and pain.These comfortable and effective orthoses are narrow in shape, allowing for easier fitting. The Trio Easy Fit Orthotic Insoles are contoured to improve the ability of the medium arch foot to function correctly and eliminate the cause of pain. This foot type is loaded with body weight, forces can overcome the natural tendency of the medial arch to lower. The keystone of the arch is the navicular bone and when this is excessively loaded, the foot\"s supporting structures become stressed as the midfoot becomes less stable. Fitted with an anti-bacteria top cover and deodorizer ensures maximum levels of hygiene are reached when wearing the Trio Easy Fit Orthotic Insoles. These orthotic insoles are designed to fit shoe sizes 9 - 10.5; a range of other sizes are also available in this department of our online shop.