Technomicro microfibre upper | Air Teflon mesh and Cambrelle lining | Replaceable shin plate | Micro adjustable and replaceable buckle system | Flex System upper | Exclusive and patented Flex System with Hyper | Extension Block | Fully adjustable calf area Wider calf upper (+ 3 cm). Adjustable system between the calf, shin and leg upper which allows to widen the circumference of the boot and accommodate even the wider calves. | Replaceable Metatarsus Inserts | Toe area covered with a plastic reinforcement | Rigid, shock resistant, anatomically shaped heel cup | Assembled and replaceable boot leg, it is stitch-free | Nylon inner sole with removable arch support pad | SRS DOVETAIL sole with the innovative and patented interlocking system | SRS sole can be replaced using a standard screwdriver