Alpinestars Supertech-R Vented Boots Alpinestars Supertech R boot is the newest high performance/racing boot, constructed with hi-tech micro-fiber and designed to meet light weight and performance requirements in top level racing. The front flex area is constructed with a soft TPU mesh with shaped reliefs for abrasion resistance and natural forward and back movements. Flexible accordion synthetic leather at Achilles allows natural movement. Top gaiter follows leg contour and is made of flexible high-grade synthetic leather reinforced with rubber for maintaining shape. Full length micro-fiber panel on inner side of the boot provides a smooth surface for excellent grip and feel against the bike and protects from abrasion and heat. A lightweight rubber compound sole offers excellent grip and feel and allows for natural flex as the rider changes position and pressure on the foot-peg. Strategically positioned ventilation in heel and shin TPU, and soft TPU mesh on forefoot guides air through the boot. The separate inner boot works with outer boot to form a protective system and external TPU shin protection wraps around to outer calf and is engineered to spread and dissipate impact energy across the entire surface while remaining compact. Clip-on toe-slider provides excellent feedback and protects the outer toe box structure from abrasion. (Upgradeable to a magnesium slider). Replaceable TPU heel plate slider protects from impact and reduces friction in the event of an off. Outside entry/exit has stretch accordion panel for a close fit and ease of entrance and removal. Bio-mechanical ankle bracing boot has double hinged inner and outer torsion bars to progressively absorb flex and rotation stress on the ankle and reduce pressure and hyper extension injury to lower leg joints. Inner ankle brace constructed with fiberglass charged polyamide and ergonomically designed closed cell padding for protection and comfort. Features Extremely protective, flexible and comfortable with excellent aerodynamics Vented sections promote airflow into the boot Flexible, lightweight toe shifter allows feel for changing gears Zip mounted on accordion stretch panel gives easy closure with excellent fit Velcro tab lock the zip pull closed, keeping it flat and secure Micro adjustable ratchet top closure stows tab end inside calf TPU Polyamide compound moldings around foot bed provide impact protection Removable anatomic footbed is sculpted for precision fit SUPERTECH R is CE certified