Vented Helmet Strap Mount for GoPro Hero 1, Hero 2, Hero 3, Hero 3+, Hero 3 Plus, Hero 4 Cameras One size fits all Perfect mount to any vented bike, ski, kayak or similar sports helmet Compatible with GoPro Hero 1, Hero 2, Hero 3, Hero 3+ / Hero 3 Plus and Hero 4 cameras Construction: polycarbonate; Strap: nylon Package includes: Adjustable Strap for Vented Helmets X 1