Sauna suits are typically made from Polyvinyl Chloride (PVC), Nylon, or Neoprene. PVC (polyvinyl chloride) is a synthetic, plastic material that is very effective at trapping in heat. However, it can be difficult to regulate body temperature in PVC suits, which means you can become faint or even pass out. This material is also prone to ripping. Nylon is a more durable synthetic material than PVC and will last longer, though it will eventually break down as well. Nylon sauna suits can also trap in too much heat, so they also carry safety concerns. Neoprene is a rubbery material that makes for the most durable suit. It also holds up in the most high-intensity workouts. Neoprene is a very flexible material that provides a full range of motion. Lastly, neoprene is constructed of closed cells that keep sweat away from your body.