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Klim Helmets Size Chart

F1, F3, F5, TK1200, KRIOS, K1R
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.