Swimming is one of the best all-around exercises there is. It’s low impact, great aerobic conditioning, and requires nothing more than a body of water and a little training. Throw in a dive mask and snorkel, however, and a whole new world opens up before your eyes. From games in the backyard pool to exploring ocean reefs or local lakes, learning to use a dive mask is a critical milestone in any swimmer’s progression. That said, you don’t need a full mask and snorkel to swim laps at the YMCA, and goggles alone won’t suffice for serious underwater exploration. Here are three variations on classic dive gear that will suit any underwater environment.