This mask has several problems including a difficult GoPro mount and flimsy-seeming headstrap system, but the worst problem is that the GoPro mount lacks the metal "nut" into which the locking screw tightens. This appears to be an original design flaw and means that the mask can never be safely used with a GoPro...assuming you were able to get the GoPro mount to attach to the mask body in the first place. There were no instructions included and the text on the packaging indicates a passing -- at best -- familiarity with English.