This pair of Extra Firm, size 9 to 10.5 Trio Three Quarter Length Orthotic Insoles are contoured for navicular and 1st ray function.The Trio Foot Orthotic Insoles are contoured to improve the ability of the medium arch foot to function correctly and eliminate pain. Designed to resist excessive loading of the navicular whilst reducing stresses on the 1st toe joint. This normalising of forces, improves the ability of the medium arch foot to function correctly and support itself naturally. Fitted with an anti-bacterial top cover and deodorizer ensures maximum levels of hygiene are reached when wearing the Trio Orthotic Insoles. These are the Extra Firm Orthotic Insoles designed for optimal control and are exceptionally hard wearing for longevity. These are the Three Quarter Length, Extra Firm, Size 9 - 10.5 Orthotic Insoles; other sizes and densities are also available in this section of the website.