Oakley Aro5 Helmet - Men's Red Line Small. Specifications for Oakley Aro5 Helmet - Men's: Manufacturer: Oakley Hat Size US: Small Head Circumference: 20.47 - 22.05 in Age Group: Adults Gender: Male Color: Red Line Condition: New Included Accessories: Helmet Travel Bag and Oakley Decal Last Chance: Yes Activity/Occasion: Climbing Sports Features of Oakley Aro5 Helmet - Men's Glasses DOCK: Integrated Glasses dock to securely stow your shades and keep them handy for quick and easy access. BOA 360 FIT SYSTEM: With its soft textile feel and flexibility the TX1 Lace lies flat against your head allowing for seamless Glasses compatibility. X-STATIC BROW PADDING: X-Static harnesses the power of silver to create a powerful technology that inhibits the growth of bacteria on fabric eliminating odor for the life of the product. Also ships with secondary set of pads. MIPS INTEGRATION: The MIPS Brain Protection System is a helmet integrated low friction layer designed to reduce rotational motion transferred to the brain during an impact. Helmet Travel Bag and Oakley Decal Included Small (52-56cm) / Medium (54-58cm) / Large (56-60cm) CPSC 1203 EN1078 and ANZ2063 Certifications Package Contents: Oakley Aro5 Helmet - Men's Oakley 99469-465-S: Aro5 Helmet - Men's Red Line Small