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100% Altec Trail Bicycle Helmet

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100% Altec Trail Bicycle Helmet

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Sizing Chart


100% Altec Trail Bicycle Adult Helmet

100%'s ALTEC is the advanced rider’s choice for confidence inspiring, protective, lightweight and ventilated All-Mountain helmet. Featuring Smartshock suspended rotational system, the ALTEC’s Smartshock elastomers reduce energy transfer to the head over a wide range of speed and impact types.


  • Smartshock - 14 Point Smartshock Rotational Protective System
  • Multi-Density EPS foam - injection molded with polycarbonate
  • Massive airflow - With an impressive 15 ventilation ports
  • Altec 350g / M-Shell - Expanded coverage while still lightweight
  • Sunglass Storage - Integrated sunglass storage system
  • Multi-point adjustable visor designed - For maximum vision and goggle stowage
  • Anti-Microbial liner - Washable, moisture-wicking
  • Adjustable Ratcheting Fitment System
  • Nexus Push Release Snap-Buckle

Sizing Chart

Size Chart

With tape level, measure the widest point of your head, approximately 1/2 to 1 inch above your eyebrows.

Helmet Size CM Inches
XS/S 50 to 55 20.125 to 21.625
S/M 55 to 59 21.625 to 23.25
L/XL 59 to 63 23.25 to 24.75


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