Air, i want a top that snaps to the windshield i guess this is what you call a "low rider". Im not crazy over the clear plastic as it looks like its hard to keep free of scratches. Also I like having the top lower because of less wind resistance and better sun protection. I think I'm going to give him the go ahead on Monday after I make sure I like the way the old top fits, I never actually had it on the boat it came with it.