Product: 1Storm Motorcycle Modular Full Face Helmet Flip up Dual Visor Sun Shield: HB89 Matt Black
Brand: 1Storm
Color: Mattblack
Helmet Size Chart 
 
 S 53-54 CM 20.9/21.3 Inch 
 M 55-56 CM 21.7/22.0 Inch 
 L 57-58 CM 22.4/22.8 Inch 
 XL 59-60 CM 23.2/23.4 Inch 
 XXL 61-62 CM 23.8/24.1 Inch 
 
 Helmet Size Tips 
 
(1)Wrap a measuring tape around your head about a half-inch above eyebrows 
(2)Take measurement two to three times to pick the largest one.
DOT Approved; Size M (55-56 CM,21.7/22.0 Inch)
Advanced Modular/Flip up and Dual Lens Design (inner smoked lens/outer clear shield);
Light Weight Durable Aerodynamic Thermoplastic Alloy Shell
Beautiful Glossy UV Protective Finish
Removable and Washable Padding

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