Bern Berkeley Summer Gloss Flower Graphic Helmet with Visor, White, Small Certified ASTM F 2040, CPSC and EN 1078 W's Specific low profile fit doesn't look like a spaceship landed on your head! Adjustable fit system at back of head Zipmold foam compatible to upgrade a winter liner (sold separately) for winter sports Fits Heads 54-55.5 cm in circumference.