Altitude Helmet with FIDLOCK® by 509®
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Description

The Altitude Helmet with Fidlock® by 509® features:

  • Revolutionary neck brace ready shell profile
  • 4 Outer shell sizes
  • 11 Sizes across 4 outer shell molds ensure excellent fit, youth
  • SM - Adult specially designed thermoplastic poly-alloy outer shell
  • Dual density interlocking EPS
  • Custom fit EPS, Specially designed for North America (Intermediate oval head profile)
  • Removable, washable premium liner
  • Youth shell starts at 1260 grams
  • DOT and ECE 2205 Certified
  • Special designed expanded polyurethane chin insert
  • Class leading eye port opening dimensions, which provide optimum peripheral vision
  • Perfect 509 goggle fit
  • One piece eye port trim
  • 8 Total oversized intake/exhaust vents
  • Universal camera mount included

 Note: All helmets now come standard with new “Pro Series” liner and breath box. All new Altitude models come with Fidlock.

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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