Hyper-light and hyper-ventilated. The polycarbonate shell on this helmet is co-molded on a layer of expanded injected foam that absorbs the impact at an unbelievable weight of 190 grams! The design provides the best airflow ever made. One size (54-62) that can be regulated to fit once the helmet is on. The adjustment system tucks into the helmet for compact storage in your pack or haul bag. Includes four headlamp clips.