For mountain bikers, the Louis Garneau Robota Helmet has a specifically designed visor that adapts to the helmets design. Inner frame spreads the shock of impacts and provides support while being lightweight. Racer-styled design. Louis Garneau Robota Helmet Features: Weight: 10.2 oz/290 g Certifications: CPSC-ASTM-CEN Vents:16 Ergobuckle – Easy-to-use buckle Keylock – Easy strap position adjustment Airdry fusion – Better comfort and optimum ventilation Spiderlock Elite – One-hand quick and accurate adjustment In-Mold technology – Technology for better durability V-Pro Visor – Protects from the sun and is easy to adjustSizeHat SizeInchesCMS6 1/2 – 720 1/2 – 2252-56S/M6 1/2 – 7 1/821 1/4 – 22 3/854-57M7 – 7 3/822 – 23 1/456-59M/L7 1/8 – 7 3/423 3/8 – 24 1/257-60L7 3/8 – 7 3/423 1/4 – 24 1/259-62XL7 3/4 – 824 1/2 – 25 3/462-65.