Here's a quick and easy way to mount your gopro to your hat, without having to buy any expensive mounts.
-zip ties any length your choice
Step 1: Step 1 the Hat
first find any old hat that you have lying around, I got a old 59fifty hat.
Step 2: Step 2 the Gopro
grab your gopro, I'm using the gopro hero 4 session, but this will work with any other model
Step 3: Step 3 Zip Ties and Knife
you need the knife to cut holes in the hat to attach the gopro to your hat using the zip ties
Step 4: Step 4 Mark Out Cut Lines
place the gopro on the center of your hat, mark the edges of your gopro mount with a pen,pencil, or whatever you have handy
Step 5: Step 5 the Cuts or Holes
after making your marks remove the gopro and all you are left is a couple of lines, now gently push the knife into the line you marked, it should look like the pictures.(note only use the tip of the blade do not use the full length so the whole won't be too big)
Step 6: Step 6 Mount and Final Product
Now feed the zip tie through either hole from the bottom, loop the tie up and over the mount and through the other hole, pull the tie through the other end and pull until tight, trim off the the extra piece of the tie and you're done.
Step 7: Finished Product
now enjoy your new mount and have fun.