1. Alpinestars Fusion Leather Race Suit
I recently purchased this suit and have used it for 2 days at the track. To say that this suit flows a ton of air is an understatement. Multiple times throughout the day I had to check to make sure I had remembered to zip my leathers up as I was riding onto the track because there was so much air coming in. At one point, while riding on track, I could actually feel my base layer "flapping in the breeze" underneath the leathers.
Construction is great as can be expected with any Alpinestars product. The suit moves extremely well right off the rack and required little to no break in. I'm 5'10", 190 and am wearing a size 54 US suit.
If you're looking for a suit that flows more air than anything else on the market this is it.