I recently purchased this Onyx “Type 5” PFD (personal floatation device) to wear while kayaking. This type uses a CO2 cartridge to inflate when needed. It is Coast Guard Approved for non-motorized watercraft. I’m very happy with it.
I did a float test and even when only partially inflated it was very effective.
Once deployed you simply put the upper strap over your head and it becomes very stable with your chin resting comfortably on the top. I could float for hours this way if necessary.
My only complaint is the lack of a small pocket for must-have gear I always want with me. To that end I added a very small belt pouch used by EMTs.
I carry a flashlight, a rescue whistle, and a small folding knife. The pouch slides freely on the belt as needed.