Klim Helmets Size Charts

Klim helmets are designed to fit snug and secure when properly sized. For additional guidance, refer to our helmet sizing guide or contact our customer service team.

F1, F3, F5, TK1200, KRIOS, K1R

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Helmet Size	Hat Size	Head Circ. (in)	Head Circ. (cm)
XS	6 5/8" - 6 3/4"	20 8/16" - 20 14/16"	52 - 53
S	6 15/16" - 7 3/16"	21 4/16" - 21 11/16"	54 - 55
M	7 1/4" - 7 3/8"	22 1/16" - 22 7/16"	56 - 57
L	7 1/2" - 7 5/8"	22 13/16" - 23 4/16"	58 - 59
XL	7 3/4"	23 10/16" - 24"	60 - 61
2XL	7 7/8"	24 7/16" - 24 13/16"	62 - 63
3XL	8 3/8"	25 3/16" - 25 10/16"	64 - 65

R1 AIR FRESH AIR
Helmet Size	Head Circ. (in)	Head Circ. (cm)
S	21 21/32" - 2 23/64"	55 - 56
M	22 7/16" - 22 53/64"	57 - 58
L	23 15/64" - 23 5/8"	59 - 60
XL	24 1/64" - 24 13/32"	61 - 62
2XL	24 51/64" - 25 13/64"	63 - 64

Sizing information is provided by the manufacturer and does not guarantee a perfect fit. Please use this chart as a guide only.