Cool. That's what I assumed.The waterproofing is built-in, non-removable. I haven't been caught out in the rain wearing it, so I can't comment on its performance yet. It's got huge ventilation zippers on the sides, but doesn't flow as much as full mesh. After seeing my tattered up textile sleeve from my last (and first) street accident, I decided I wanted something with leather at least in the common abrasion areas.
Often those with built-in liners are far too warm. But I would be looking at this for spring/fall riding as I have mesh jackets for the summer.
I have a Rev'It jacket that is part mesh, with leather patches in similar locations to the Proton, but doesn't have the waterproof liner.
@Relax How about fit?