These UK Shoe Size 9.5 to 10.5 Prostep Firm Density Three Quarter Orthotic Insoles have been specially contoured to help improve the ability of the low arch foot to function correctly and eliminate the cause of pain.By physically supporting the ST (sustentaculum tali), reducing the 1st Ray pressure and customer posting the heel and forefoot, forces normalised, function is restored and symptoms resolved. The Prostep Orthotic Insole range can be modified using the 0, 3 or 5 degrees medial or lateral posts. The low medial arch support helps to support actions of plantar fascia and resists high pronation forces. Fitted with an anti-bacterial, deodorising top cover ensures maximum levels of hygiene are reached when wearing the Prostep Orthotic Insoles. These are the Three Quarter length, size 9.5 - 10.5, firm density Insoles; other length, size and density insoles are also available in this section of the website.