Beyond The Pale
Join Date: Nov 2014
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Re: Buoyancy in inflatable vests
Bouyancy isn't as much importance here as keeping the face up, and out of water. As mitempo mentioned, most people are naturally bouyant, more so if they are Walmart patrons, even more so after they have stewed at Sea a few days.
I once took a Scuba Diving Class, and one test that was made was how much added Lead weight was needed to be neutrally bouyant at reasonable depths- I needed none. A natural Sinker.
Unless taking such a Class, the only way to tell is to try it out in Water, Salt or Fresh as appropriate. If you can float on your back, with limbs extended, and can just muse on the sky, you are bouyant. If your arms and legs hang down, and you go under when exhaling, you are not.
In any event, the Importance is keeping your face up and out of the water, especially if unconscious. Pretty much everything else is secondary.