We checked with Jorge the
Snorkel / Deckjacket / SNODECK
Jorge from Ecuador was the person we asked to try as hard as he can guess he did as you can see and as we live and design all the stuff in munich we try to test the gear around town.
Waterproof ( only from the outside ;-) and very comfortable to move and twist in the waves he could work out a 360 as well.