The Alpinestars Tech 10 boot has a revised ergonomic design. The revolutionary development concepts have produced the most streamlined, balanced and protective MX boot yet to hit the market. Inner Ankle Brace System: The new MX brace features a patented double-hinged assembly. However, the Tech 10 brace shares no common components with the Supertech version, besides the hard-compound torsion bars, which have been designed specifically to cope with the particular demands of MX riding. The double hinge joint allows upper and lower protective structures to protect the ankle and heel, while giving complete freedom, flexibility and feel to the rider by following the natural movements of the foot and ankle, with no constraint until the point of over-extension. To give the rider the ability to further lessen stresses put on the knee, a replaceable softer-material inner bar is included with the Tech 10 allowing the rider to customize the degree of ankle control and therefore the amount of possible stress transmitted to the knees when the boot gets into deep ruts, etc. The system also minimizes the chances of sprains and twists, while also protecting the ankle from lateral impacts. It is comfortable to wear, extremely strong, stable and crucially, lightweight. Revolutionary external structure features ultra-low profile design to minimize weight at the lower section of the boot and upper design developed for controlled flexibility, streamlined profile and superior grip against the bike. Innovative biomechanical inner bootie provides the ultimate level of support and safety. Torsion bars control ankle and leg rotation, while allowing freedom of movement. Bootie structure features polyurethane protection and shock absorbing padding on the heel and ankles and an ultra-thin and flexible forefoot area for increased feeling of the controls. Perforated bootie is washable and replaceable. Lightweight upper combines full-grain leather with impact and abrasion-resistant polyurethane shell for unmatched levels of safety. Polyurethane guards the toes, foot, heel, ankle, calf and shin with extra-hard compounds on the toe-box, heel and Achilles tendon. Innovative polyurethane spine protects the heel, controls flex and features a hyperextension guard. Outer side of the boot features anti-torsion polyurethane panel on the ankle for flexibility and support. Ultra-comfortable and precision-fit interior features new polyester fabric lining with open-cell foam and a shock absorbing shin pad. New and exclusive dual-compound sole is seamlessly integrated to the multi-density foot base structure with built-in support. Sole provides superior durability, grip, feel and a high level of structural rigidity. Advanced closure system features 3 techno-polymer and aluminum buckles for easy adjustability with a precise, secure and streamlined fit. Buckles feature memory, a quick-release / locking system and a self-aligning design for easy and precise closure. Three buckle system works in conjunction with the entire internal structure to provide excellent support and flexibility. Inner side of the boot is designed for maximum grip against the bike from top to bottom and features polyurethane panels for heat and abrasion resistance. New form-fitting polyurethane gasket seals water out of the boot. Note: White model features airflow ventilation system.