I ditched my paco type - don't recall make, think it was a paco - 10 years ago for a Pacific Outdoor Equipment Bomber Pad, 3" thick built like a paco with some form of "raft-like" material on bottom, a lighter (half as thick) top material that is bonded top and bottom. They are perfect, self-inflating and I being a fat-ass add a half-dozen puffs for good measure. It is almost like sleeping on my temper-pedic.
Unfortunately they are out o' business and the pads are no longer available...if you see one anywhere buy it, best sleeping pad ever made in my opinion. here's a link for reference: Pacific Outdoor Equipment Bomber Sleeping Pad | Backcountry.com
. They made several thicknesses and sizes. It's really a bummer they are out of business, they also made the best dry duffel I've ever seen. We've had two duffels, and two pads for over 10 years, the duffle is my luggage, been around the US, on hundreds of river, hunting and camping trips. Still in great shape and totally dry. best purchases I've ever made, bar none.
With that said a quick internet search turned up a similar item, but lighter duty (no pvc bottom) found at REI, it might be a supper comfy option but probably not for laying on the boat...Product Page
I can't stand the bubble pads, why would I want to sleep on just foam when I could be sleeping on air and foam? I really hope Jack jumps in here - it would be nice to see someone revive the idea of the Bomber pad - best of both worlds (durable boat pad that is bonded and thus truly inflatable) IMHO.