The ALPINESTARS Racing Boots SMX S are certified to the EN 13634:2010 CE standard, featuring a durable microfiber upper for comfort and fit. These boots come with numerous advanced internal and external safety features. The SMX S boots boast an ergonomic forefoot design, a breathable lining, and ALPINESTARS' unique rubber compound sole for optimized support and performance. - Durable microfiber upper construction for maximum flexibility and comfort. - New ergonomic last ensures higher precision at the controls and superior overall profile, fit, and comfort. - New TPU shin protector offers superior impact and abrasion resistance, tested in racing conditions. - Side TPR-injected ankle support provides optimized protection and stability. - Dual-density TPU ankle protectors cover both the lateral and medial aspects for excellent all-around protection. - Breathable textile inner lining with anti-slip suede reinforcement in the heel area. - Replaceable bi-injected TPU sliders feature a new easy screwless attachment system for faster replacement. - Integrated TPU shift pad with technical texture for protection and grip. - Medial side entry/closure system with a zipper mounted on an elastic panel and a wide Velcro flap for flexibility and a secure fit. The entry is wide for easier on and off. - Internal toe cap protection layered under the upper for durability, enhanced feel, and performance. - New removable dual-compound anatomical footbed integrates EVA and Lycra for performance, comfort, and support. - ALPINESTARS' new unique rubber compound sole promotes improved feel, grip, water drainage, and durability.