These Trio Easy Fit Insoles have been manufactured to fit size 3 to 4.5 feet, providing the user\'s feet with all the support they need to minimise stress on the medial side and the navicular.As a result this narrower device provides easier fitting in a vast range of shoes. 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 Insoles are designed to fit shoe sizes 3 - 4.5. Please note that several other sizes are also available to view in this section of our website.