When you purchase a snorkeling mask and a snorkel, they're usually purchased separately. When you go to put your mask and your snorkel together, basically you have what's called a snorkel keeper right on the snorkel itself. This is going to attach on the left-hand side of your mask strap. You'll notice there's a little open piece on the bottom or a slit. That will slide right over the snorkeling mask strap itself. The snorkel keeper also slides up and down so that when you do have it in your mouth, you'll have it in a comfortable position. So once again, taking it off, slide it off through here, putting it back on, pull back on the little clip, slide it over the strap on the left-hand side of the mask.