There are two types of Snorkel Vests, snorkel jackets and over the head snorkel vests. Both are very effective in creating a safe snorkeling experience. A snorkeling jacket functions just the way it sounds by allowing you to put it on one arm at a time. The over the head snorkeling vest is put on like a shirt without arm holes, it slips over the head. For more information go to Snorkeling Info or call 1-855-88-OCEAN.