Black Diamond's superlight, go-anywhere helmet got even lighter. The updated Vapor helmets two-piece construction contains a layer of super-light Aluula composite under the polycarbonate crown for added protection and reduced weight. Molded EPP foam makes up the sides, providing ample venting with the same sleek aesthetic. An ultralight cord fit system makes adjustments and fit easy to fine-tune. Streamlined (and replaceable) headlamp clips are ready for alpine starts or after-dark raps. Multi-material construction to minimize weight and bulk while maximizing durability Lightweight and packable cord fit system stows and adjusts easily Geometric, open-air design allows unparalleled airflow and iconic silhouette UIAA and CE Certified Weight S/M: 155 g (5.5 oz) M/L: 180 g (6.35 oz) Size S/M: 53-59 cm (21-23 in) M/L: 58-63 cm (23-25 in) Materials Shell: Polycarbonate Foam: EPP, EPS, Aluula