Pull the socks onto your feet. Stand on a piece of cardboard, and trace both feet with a pencil; cut cardboard along lines. Remove socks. Use a sewing pencil to trace the templates on sueded fabric and fusible webbing, a material that bonds fabrics together; cut them out.
Slide a cardboard template into each sock, positioning it where you want to iron on new soles. Place fusible webbing between sueded fabric and sock's sole; iron according to webbing directions, and remove cardboard.