Innovation, years of research, technical beauty and design define the Troy Lee Designs A1 Helmet. This lightweight, fully encapsulated all-mountain helmet utilizes maximum coverage and dimension to keep you safe and protected in all riding conditions. The reinforced polycarbonate shell, in-molded with an EPS liner, extends down the sides and back of your head for maximum protection and durability. Sixteen large vents combined with a specially designed air channeling visor, surrounded by dynamic graphics, keeps your head cool and stylish. The single piece, ultra plush, removable and washable anti-microbial liner provides a dry, comfortable fit. The triple position adjustable retention system allows for a customized fit, while the adjustable visor features anodized aluminum hardware. Whether you're charging single track, riding dirt jumps or grinding out miles on the XC bike, the A1 helmet offers the premium fit, protection and style you want. 376 g. (MD/LG). XS/SM (54-56cm), MD/LG (57cm-59cm) or XL/XXL (60-62cm).