SR Sole The Sidi SR, or sole replacement system, sole is the markets only sole fully replaceable via a standard screw driver and the SR quarter turn screws. This patented sole replacement system has the extra technical feature of being able to better distribute loads from the footpeg fully across the sole. While the SR sole has a stiffer feel than the TA sole (or other companies sewn on soles) it has the added benefit of presenting a smaller footprint than traditional sewn on soles thus offering less of a target during on track encounters or hidden stumps in the brush. Dual Flex System Allows for easy movement forward and backward but is extremely strong side to side giving the rider the finest in ankle protection and long lasting comfort. The hinged, dual position, stitch-free upper is constructed from injection-molded plastic. With the exclusive Dual Flex system and the four floating, independent straps the Crossfire can provide each rider with a personal fit no matter his body shape or if he uses knee braces or not. Adjustable Calf System Sidis exclusive, patented, adjustable calf system allows the rider to adjust the diameter of the Crossfire boot at the calf. This system, along with longer upper straps, allows the Crossfire boot to accommodate riders with larger calves easier than any other boot now available. The Crossfire can accommodate riders with up to a 22-inch calf diameter 14 inches above from the bottom of their heel. The inner plastic plate is made of two different materials a rigid one to support the boot and a heat resistant one to protect the riders leg from exhaust heat. All components of this system are fully replaceable and are available in a wide variety of colors. Heel Detail Three extended ribs are featured at the back of the boot to assist the rider in making upshifts with his heel when starting a race. Rigid, shock resistant, anatomically shaped heel for maximum protection. Non-Bootie Designs Sidi boots do not incorporate inner booties into their design, and for good reason. Booties make the design larger and cumbersome add to the boots thickness, which interferes with shifting, plus the inner booties retain body heat affecting the riders performance and comfort. Buckles Sidis exclusive cam-lock buckle system is acknowledged as the finest system on the planet. It must be as most of Sidis competitors have attempted to copy various aspects of it. The cam-lock buckle system incorporates a strap memory retention system. Adjust the straps once and they will be at the same position for every ride after that! Toe Areas The tip of the toe on the Crossfire boots are covered with plastic to protect the base material and seems against abrasion from brush etc. Plastic shift and brake lever guards on the top of each foot area. Heat Shields Each Sidi boot is equipped with an anti-heat undressed leather protection panel at the same height of most motorcycles exhaust heat shields. Composite Insole A cushioned liner is provided that can be removed if the rider desires a more roomy fit. Sidi does not use steel shanks riveted to its insole like most manufactures, details such as this enable Sidi boots to enjoy a multi year service life versus the competitors multi month lifespan as over time, a steel shank can deteriorate, rust and fracture exposing the rider to injury. Lorica Outer is fully constructed with Lorica a composite micro fiber material created from strands less than one thousandth the thickness of silk. When injected with special resins, these fibers act like natural leather skin, but with the addition of better strength, softer texture, lighter weight and better moisture protection. Lining Cambrelle is a lining that, due to its particular polyimide structure, guarantees a rapid drying rate after the boot gets wet or sweaty. This prevents the onset of mold forming which extends the boots lifespan dramatically. The Teflon treated mesh panels in the rear calf area of the boot allow humidity to escape while the boot is in use.