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F01021500-110-101

509 Atmosphere Helmet

Size Guide
509 Sizing Chart

How to Measure

Head: Measure circumference of head just above top of ears and eyebrows.

Waist: Measure under arms, around the fullest part of the chest. Keep tape level across back, comfortably loose.

Chest: With arm fully extended, measure center back of neck at the spine to the wrist bone.

Chest: Measure under arms, around the fullest part of the chest. Keep tape level across back, comfortably loose.

Inseam: Without shoes, measure inside of leg, from groin to floor.

Helmet Sizing 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


Youth Helmets 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


Men's Sizing X-Small Small Medium Large X-Large 2X-Large 3X-Large

Chest

34 - 36

36 - 38

39 - 41

42 - 44

45 - 47

48 - 50

52 - 54

Sleeve

27

28

30

32

34

36

36

Waist

30

32

34

36

38

40

42

Inseam

29

30

31

32

33

34

34

Short Inseam

29

29

30

30

31

31

31

Tall Inseam

34

34

35

35

36

36

36

Gloves

7

8

9

10

11

12

13


Women's Sizing X-Small Small Medium Large X-Large 2X-Large

Chest

30

32

34

36

38

40

Sleeve

24

26

28

30

32

34

Waist

28

30

32

34

36

38

Inseam

29

30

32

34

36

38

Gloves

5

6

7

8

9

n/a

10 items left

509 Atmosphere Helmet

Even the sky won't limit your riding in the 509's new game-changing Atmosphere Helmet. Built for riders who prioritize comfort, cost-effective performance, and safety. When entering into riding on snow safety is a priority, with both DOT and ECE 22.06 certifications this helmet meets international safety standards for ultimate protection. The double D-ring chin closure and strategically placed venting ports manage moisture and enhance airf. . . Show More >

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