The Sidi ST and ST Air have incorporated the Cam Lock buckling system from the Sidi off-road boots and included them on the closure system. The Cam Lock buckles are hands down the best off road boot closure system. Adding these buckles to a street model will ensure a secure and comfortable closure around the calf. The buckles also allow for a quicker "in and out" while still being very protected and locked while riding.  Non vented and vented versions will be available Black, black/white, black/blue or black/red An all new upper level sport boot features an easy entry system as well as the finest support and protection features. Available at your Sidi dealer in late December External ankle brace system. Composite inner sole. Dual compound sole. Sidi's exclusive cam-lock buckle system for easy entry and boot removal while still offering a perfect glove like fit. Bolt on (no Velcro!) replaceable, adjustable and aerodynamic nylon scuff pads on the toe. Lorica outer construction. Removable arch support. Double stitched in all high stress areas. Closable air vents on the foot outer. All bolt on parts are replaceable. An elastic panel adjacent to the entry zipper allow a bind free zip and improved fit. DuPont polymer toe shift pad. Perforated Teflon treated nylon lining. Replaceable, Shock absorbing heel cup. The ST can accommodate riders with up to an 15-inch calf diameter 12.5 inches above from the bottom of their heel. Padded Achilles area.