Bern Unlimited Morrison Helmet with Green Visor 22 1/2 - 24 in Zip mold liquid foam technology offers a thinner profile than the standard EPS grey foam other brands use, giving you a much smaller helmet shape Removable sun and brush visor, gives you options for both style and functionality Crank Fit dial on back of helmet quickly secures or loosens the fit around your head, super easy to adjust - even on the fly Meets Safety Certification ASTM F 2040, CPSC and EN 1078 and WINTER UPGRADE KIT AVAILABLE SEPARATELY