I'm over 50 and make my living by doing alot of walking. These boots are fantastically comfortable. They do run true to size if you want to wear thin socks or tights. If I were planning on wearing thicker socks consistently, I would follow others advice by ordering 1/2 size larger. The insole is easily removed to accomodate other orthotics. The overall fit through the calves and ankles across the instep and around the heel feels as if they were custom made just for me! Thank you Tsubo! Looking forward to buying more in the future!