Using your TBS ETHIX V3 Goggle Strap is a breeze. First, adjust the strap to fit your head comfortably. You can do this by simply using the slip adjustment feature. Next, if you're using it with a battery, place the battery in the holder and the rubbery grips will keep it secure. When it comes to maintenance, a gentle wipe with a clean cloth will do the trick. Make sure to keep it away from sharp objects to avoid tearing the double - stitched side straps. Also, store it in a cool, dry place when not in use. This will help your goggle strap last longer and perform at its best.