Mount your iphone to your gopro headstrap. To be able to record video hands free, or watch movies etc.. And you will look very cool. http://www.youtube.com/watch?v=i73-y4GxdDQIt is used to mount your iPhone to your gopro head-strap mount. To be able to record video hands free, or watch movies etc.. http://www.youtube.com/watch?v=i73-y4GxdDQYou must print with support structure. I made it for my iPhone 4S, but the 4 and 5 might also work, i think they are the same size ? Write a comment if it does / don't !Update: I found a similar iphone mount that mounts to a hat instead of a gopro headstrap. Have a look at 2ROBOTGUY:s "IBITE" http://www.thingiverse.com/thing:22251And it predates my mount, so i wasn't the first person wanting to strap a iphone to the head :-)