Availability: XS/50 - 54cm, S/54 - 56cm, M/L 57 - 59cm, XL/XXL 60 - 62cm Colors: gray, silver, black, blue, red, green A helmet with a long and legendary history. The A1 is TLD's response to those seeking an all-mountain helmet with excellent fit, protection, and style. Equipped with the innovative MIPS system that minimizes rotational forces to the brain, and an EPS inner shell, this lightweight half-shell with the absorbing inner layer offers outstanding impact protection across the board. A total of 16 ventilation openings ensure more than adequate airflow, and with the quick-drying comfort inner lining, you are ready for a whole day on the trail.