SIDI Crossfire 3 Boots - Black
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 wider calves
Replaceable metatarsus inserts
Toe area covered with plastic reinforcement
Rigid, shock resistant, anatomically shaped heel cup
Assembled and replaceable boot leg: stitch-free
Nylon inner sole with removable arch support pad
Replacement parts available. SIDI boots are a narrow fit and they recommend going up a size from what you would normally wear.