22 years ago I had the opportunity to put on an Imperial (Life saving suit?). It was a "quick donning" suit. It had one-way valves in the feet to vent air. Other wise you could easily wind up head down with the feet inflated and not able to right yourself. I did exactly that in a pool wearing a poopie suit after stepping off the high dive. Rescue swimmers, good idea! I swam around in a fjord for 40 minutes with no sensation of cold. Had the survival vest on underneath and determined it was possible to pull an arm into the chest area, get the flare gun loaded and pushed out the top of the zipper, in calm water. But, this was a 400% stretch, double faced, "Quick Donning" neoprene suit. If wore this as a constant wear suit you would have no problem passing your next weight check if you survived the dehydration.