Altitude Helmet by 509® 15HAB
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Description

The 509® Altitude Helmet outer shell is made of a specially designed thermoplastic poly alloy material for maximum shell strength with minimal weight. The innovative aerodynamic channels run across the entire contour of the helmet. This helmet features:

  • Dual density, interlocking EPS foam liner
  • Designed expanded polyurethane chin insert that provides front impact protection
  • Six integrated vent scoops that provide necessary ventilation
  • Eight total intake/exhaust vent ports
  • Cold weather breath box
  • Locking top center mount that holds the visor in place and prevents unwanted visor movement
  • Meets or exceeds DOT & ECE 2205 safety certification standards

Note: We do not accept returns on helmets.

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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