Sizing chart: 509 Helmets

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509 Helmet Size Chart

When measuring your head, use a cloth tape. Start it just above your eyebrows and circle it around the thickest point in the rear of your head and then reference the size guide above.

Men's

Size US Hat Size Inches Centimeters

X-Small

6 5/8 - 6 3/4

20 7/8 - 21 1/8

53 - 54

Small

6 7/8 - 7

21 5/8 - 21 7/8

55 - 56

Medium

7 1/8 - 7 1/4

22 1/2 - 22 5/8

57 - 58

Large

7 3/8 - 7 1/2

23 1/4 - 23 1/2

59 - 60

X-Large

7 5/8 - 7 3/4

24 - 24 1/4

61 - 62

2X-Large

8

24 3/4 - 25

63 - 64

3X-Large

8 3/4

25 1/4 - 25 3/4

64 - 65

4X-Large

9

26 - 26 1/4

66 - 67

Women's

Size US Hat Size Inches Centimeters

Adult X-Small

6 5/8 - 6 3/4

20 7/8 - 21 1/8

53 - 54

Adult Small

6 7/8 - 7

21 5/8 - 21 7/8

55 - 56

Adult Medium

7 1/8 - 7 1/4

22 1/2 - 22 5/8

57 - 58

Adult Large

7 3/8 - 7 1/2

23 1/4 - 23 1/2

59 - 60

Adult X-Large

7 5/8 - 7 3/4

24 - 24 1/4

61 - 62

Adult 2X-Large

8

24 3/4 - 25

63 - 64

Youth

Size US Hat Size Inches Centimeters

Youth Small

6

18 1/8 - 18 7/8

47 - 48

Youth Medium

6 1/8 - 6 1/4

19 1/4 - 19 5/8

49 - 50

Youth Large

6 3/8 - 6 1/2

20 - 20 1/2

51 - 52

Goggles

 Standard Size Goggles XL Size Goggles

Fits Helmets Size XS to XL 


 Fits Helmets Size 2X to 4X 
XL goggles have more foam to create a better seal for larger helmets