Scorpion USA as your partner for excellent motorcycle helmets and motorcycle accessories. Their Vision can be described in these five words: Protection, aesthetics, dynamic, comfort and innovation. In contrast to other helmet manufacturer is the production and testing completely in our own factory. TCT Composite Shell ConstructionLightweight DesignSNELL M2010 CertifedNew Ellip-Tec Ratchet mechanismAirFit Liner Infation SystemEverClear No Fog FaceshieldKwikWick 2 Anti-Microbial Fabric LinerKwikFit Cheekpads Accomodates EyewearAero-Tuned VentilationEmergency Release SystemTitanium Double D-RingVent Locking Pin Lever2013 Model Sizing Note: X-Small - Hat Size: 6 5/8 - Centimeter: 53-54 - Inches: 20 7/8 - 21 1/4 Small - Hat Size: 6 7/8 - 7 - Centimeter: 55-56 - Inches: 21 5/8 - 22 Medium - Hat Size: 7 1/8 - 7 1/4 - Centimeter: 57-58 - Inches: 22 7/16 - 22 13/16 Large - Hat Size: 7 3/8 - 7 1/2 - Centimeter: 59-60 - Inches: 23 1/8 - 23 5/8 X-Large - Hat Size: 7 5/8 - 7 3/4 - Centimeter: 61-62 - Inches: 24 - 24 3/8 2X-Large - Hat Size: 7 7/8 - 8 - Centimeter: 63-64 - Inches: 24 13/16 - 25 3/16 3X-Large - Hat Size: 8 1/8 - 8 1/4 - Centimeter: 65-66 - Inches: 225 9/16 - 26