Hydro-Fit 129 X-Small Wet Vest II (Child) If you're serious about sports conditioning, cross training or water therapy, the WET VEST® II will match your commitment. For more than two decades, the WET VEST II has been the performance choice for serious athletes, rehabilitation patients, and fitness enthusiasts. Its patented design incorporates flotation panels sewn into a comfortable and snug fitting body vest. Like a wet suit, it provides a thermal layer that insulates your body in the water. Engineered to provide secure and balanced support, the WET VEST II fits much like a bathing suit, contouring to your body and allowing maximum freedom of movement.