Bern Unlimited Women's Berkeley Snow Helmet with White Liner Meets Safety Certification ASTM F 2040, CPSC and EN 1267 Bern's exclusive Zipmold foam is a liquid foam injection process that provides a thinner certified fit than other brands Fit system at back of the head customizes to the shape of the head, keeping it stable and comfortable Compatible Bike/Skate/Warm Weather liner available (sold separately)