Priority Bicycles Ultra Light, Breathable Helmet Extremely lightweight, under 9 ounces! 22 air vents for maximum breathability CPSC and CE safety approved Two colors: Matte black and matte white Two sizes: Medium (head circumference 21.6-22.75, hat size 6 3/4 - 7 1/8) and Large (head circumference 22.75-24, hat size 7 1/4 - 7 5/8) Extremely lightweight, under 9 ounces! 22 air vents for maximum breathability CPSC and CE safety approved