Hovercrafts can flip over and toss you into the frigid water when moving from water to ice or ice to water.
This guy was not wearing a pfd on Saturday afternoon, April 9, 2011 and he drowned in a hovercraft flip-over .....
http://www.nashuatelegraph.com/news/...raft-capsizes/ .... close to Harilla Landing enroute somewhere to his island house on Cow Island or something.
Wearing a pfd can become uncomfortable or too warm so wearing a 2"x 24-36" foam noodle tied tight around the waist has enough flotation to keep you afloat and is more comfortable to wear, plus it makes swimming the breast stroke and side stroke easy-peasy. Plus it can easily be worn tight around the waist under a shirt or a coat so's you don't look ridiculous wearing a bright colored foam noodle.