509 Altitude 2.0 Offroad Pro Helmet SciFi White

Altitude 2.0 Offroad Pro Helmet

Sci-Fi White / XL
$209.96 $299.95
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509 Altitude 2.0 Offroad Pro Helmet SciFi White
  • 509 Altitude 2.0 Offroad Pro Helmet SciFi White
  • 509 Altitude 2.0 Offroad Pro Helmet SciFi White
Altitude 2.0 Offroad Pro Helmet

Altitude 2.0 Offroad Pro Helmet

$209.96 $299.95
ColorSci-Fi White
Size

509 – Helmets

  • A properly fitted helmet is snug with even pressure all around — never painful. The liner breaks in after several hours of riding.
  • Between sizes? Try both — no helmet protects well if it's too uncomfortable to wear.

Adult

XSSMMDLGXL2XL3XL4XL
Head (cm)53–5455–5657–5859–6061–6263–6464–6566–67
Head (in)20⅞–21⅛21⅝–21⅞22½–22⅝23¼–23½24–24¼24¾–2525¼–25¾26–26¼
US hat size6⅝–6¾6⅞–77⅛–7¼7⅜–7½7⅝–7¾88¾9

Youth

YSYMYL
Head (cm)47–4849–5051–52
Head (in)18⅛–18⅞19¼–19⅝20–20½

Measure the circumference of your head just above the top of your ears and eyebrows

509 helmets fit similar to KLIM — same head measurement, same size

How to measure

Using a flexible tape, measure the circumference of your head just above the top of your ears and eyebrows. Measure a few spots and use the largest number.

 Elevate your game with the next-generation performance of the 509 Altitude 2.0 Offroad Pro Helmet featuring the latest in weight-saving design and breathable comfort.

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