The hybrid body is made from a durable injection-molded shell design, and for breathability, the Rockstar has 4 side vents. Made with \'One size\' the Camp Helmet is only made in size 53-60cm, and is adjustable between those lengths with a slider and a comfort chin strap. The Rockstar has a hybrid construction, and is also headlamp compatible, making it ideal for caving as well.Dri-Lex inner linerHeadlamp compatibleChin strapOne size - 53-60cm4 side ventsInjection-molded polyethylene shellEN 12492 certifiedWeight: 390g