Although some prefer to go without a wetsuit, it is an essential part of a diver's gear. The wetsuit helps your body to retain its heat, insulating it from the water that you are in. Even if you are diving in the tropical waters, it is important to wear a wetsuit. If you are worried about the heat and whatnot, you can opt for a shorter wetsuit that leaves your arms and legs bare. Remember that a good wetsuit should be a snug fit, not too loose, but not so tight that your movements have to be restricted.