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Not sure about your helmet size? Get an "S1 Helmet Co. Fit Kit" and eliminate the guessing.
You'll get 7 different thickness of sizing liners so you can fit your S1 Helmet perfectly today; and if your head grows in the near future!
Size: X Small- XXX Large included in fit kit.
FIT KIT sizes all S1 Lifer Series shells! Thats right, Mini Lifer, Regular Lifer and Mega Lifer!
(S1 Mini Lifer Helmets 19" - 20.5")
(S1 Lifer Helmets 21" - 23.5")
(S1 Mega Lifer Helmet 24" - 25.5")