Petzl VERTEX BEST. A16_1. $95.00. High strenth shell protects against impact (EN 12492 and EN 397 standards). Non-ventilated helmet meets all optional requirements of the EN 397 standard: electrical insulation, molten metal splash, lateral deformation, use in cold temperatures. Shell has side slots that can be used for mounting hearing and/or face protection and four clips for mounting a headlamp. Webbing suspension system guarantees optimal comfort. Headband adjustable in circumference and height. Chinstrap designed to reduce the risk of the helmet coming off as a result of an impact during a fall: it has a breaking strength greater than 50 daN (CE EN 12492 mountaineering helmet standard). Sizes: 53...63 cm. Available in Black, Orange, and White. CE, ANSI Z89.1 - 2003 TYPE 1 CLASS E.