Yeah, we have been hiking, fishing, canoing in the ADKs for the last 30-40 years. This looks very interesting to eliminate the our PFD's, turning them to real tripple duty gear: vest, PFD, sleeping pad.
I didn't notice the lack of zippers, sorry.
I think I would have to keep the standarard 1/2" foam to reach the minimum required for a PFD. Though, the thinner stuff is certainly a better option for a vest.
Yeah, I toss and turn a lot. Usually ending on my side or stomach for up to hour.