Scuba diving drysuits can be split into two main types; Membrane and Neoprene, the main difference is how you control your level of insulation. Membrane Vs Neoprene Membrane drysuits are very lightweight but have very little insulation by themselves so they have to be paired with an undersuit. If you are diving in colder waters you will require a thicker undersuit to trap more insulating air next to your body.