The MaxXmove Elastic Adjustable Head Strap for GoPro Hero 3+, 3, 2, and 1 is waterproof head-strap camera mount that is compatible with any GoPro camera and fits directly around the head or helmet on a one size fits all basis. The mount is intended for hands-free, point-of-view filming and is fitted with adjustable nylon straps and polycarbonate buckles. This head strap measures around 6 to 7 inches in diameter and 12 inches at full stretch.