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Giro, Atomic, and K2 Helmet Sizing Chart

Determining your helmet size.

  1. Use a soft measure tape for best results.
  2. Measure around your head, just above the eyebrows staying parallel to the floor.
  3. If you wear a headliner, measure with it on.
  4. If you're between sizes, go to the larger size.
Giro Kid's Helmets Giro Adult Helmets SIZES Atomic Helmets K2 Helmets
49 - 52cm
19.25 - 20.5 in.
XS / SM
55 - 55.5cm
20.5 - 21.75 in.
MD / LG
52 - 55.5 cm
20.5 - 21.75 in.
SMALL 53 - 56 cm
21.25 - 22.75 in.
51 - 55 cm
20 - 22.5 in.
55.5 - 59 cm
21.75 - 23 in.
MEDIUM 56 -59 cm
22.75 - 23.25 in.
55 - 59 cm
22.5 - 23.25 in.
59 - 62.5
23 - 24.25 in.
LARGE 59 - 62 cm
23.25 - 24.25 in.
58 - 61 cm
23 - 24 in.
62.5 - 65 cm
24.5 - 25.5 in.
EXTRA
LARGE
58 - 61 cm
23 - 24 in.

Shop Ski Helmets Now

Watch this video to learn about ski helmet construction, sizing, features and more!