I've got the Darien Jacket with liner and pants. I can open the under arm vents all of the way (took practice), liner too. Back vent is a no go while your riding. Depending on the weather conditions I keep the back vent open or semi open, then regulate air flow with the under arm vents. I've got 30,000 miles on it in three years. 100% waterproof if you care for it properly. I like it a lot. The only thing I don't like about it is the collar. Most Jackets have felt inside of the collar. The Darien doesn't. It rubs on my neck. I probably need to add some felt.