MAX MOTORSPORTS..Family-owned and operated in the USA Thank you for supporting small business! O'Neal Adult Trailfinder Split Bicycle Helmet Lightweight In-mold Technology fuses the inner EPS and shell together: more durable and ventilated plus increased protection and energy dispersion Multiple air vents for optimal ventilation and cooling Ultra-plush removable, sweat absorbing and washable padded inner liner Retention system for perfect individual fit and easy one-hand adjustment Height adjustable visor Exceeds EN1078 safety standard for bicycle Helmets Shell Weight (size Large): 340g (±25g) With tape level, measure the widest point of your head, approximately 1/2 to 1 inch above your eyebrows. Helmet Size CM Inches S/M 55 - 58 20 1/2 - 22 3/4 L/XL 59 - 61 23 1/4 - 24 Domestic Shipping Free USPS or UPS shipping included - USA customers only