Altitude Carbon Fiber Helmet with FIDLOCK by 509
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Description

The full Carbon Fiber Altitude helmet – the same fit and function you’ve come to expect, now crafted from one of the strongest materials on the planet.

  • Comes standard with universal camera mount
  • Comes standard with Fidlock® east open magnetic strap clasp
  • Innovative aerodynamic channels and 8 intake/exhaust vent ports
  • 8 Sizes across 3 outer shell molds ensure excellent fit
  • Meets and exceeds DOT & ECE 2205 safety certification standards

509 Helmet Sizing
*Measured at top of head above ears and eyebrows
Size XS SM MD LG XL 2XL 3XL 4XL
Hat Size 6 5/8-6 3/4 6 7/8-7 7 1/8-7 1/4 7 3/8-7 1/2 7 5/8-7 3/4 8 8 3/4 9
Centimeters 53-54 55-56 57-58 59-60 61-62 63-64 64-65 66-67
Inches 20 7/8-21 1/8 21 5/8-21 7/8 22 1/2-22 5/8 23 1/4-23 1/2 24-24 1/4 24 3/4-25 25 1/4-25 3/4 26-26 1/4
509 Youth Helmet Sizing
Size Youth SM Youth MD Youth LG
Hat Size 6 6 1/8-6 1/4 6 3/8-6 1/2
Centimeters 47-48 49-50 51-52
Inches 18 1/8-18 7/8 19 1/4-19 5/8 20-20 1/2
509 Helmet Sizing
*Measured at top of head above ears and eyebrows
Size XS SM MD LG XL 2XL 3XL 4XL
Hat Size 6 5/8-6 3/4 6 7/8-7 7 1/8-7 1/4 7 3/8-7 1/2 7 5/8-7 3/4 8 8 3/4 9
Centimeters 53-54 55-56 57-58 59-60 61-62 63-64 64-65 66-67
Inches 20 7/8-21 1/8 21 5/8-21 7/8 22 1/2-22 5/8 23 1/4-23 1/2 24-24 1/4 24 3/4-25 25 1/4-25 3/4 26-26 1/4
509 Youth Helmet Sizing
Size Youth SM Youth MD Youth LG
Hat Size 6 6 1/8-6 1/4 6 3/8-6 1/2
Centimeters 47-48 49-50 51-52
Inches 18 1/8-18 7/8 19 1/4-19 5/8 20-20 1/2

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