I've had something like 8 soft shells over the years (windstopper, schoeller, driclime, etc). I like the concept, but they all had something lacking. This is getting closer to the "one jacket" to grab for all outings. First, being Windstopper, it has great weather protection (IMHO, close to gore-tex but without feeling like wearing a garbage bag). The fabric is amazingly soft and quiet (best Windstopper I've ever felt), and has a brushed interior that feels great against bare skin- like an old flannel shirt. It is very light, and has HUGE vents, so breathablility is not really an issue for me. The hood is well designed, highly adjustable, and fits snugly (though I can't yet comment on helmet compatibility). The one drawback, which might be a deal-breaker to some, is that there are no handwarmer pockets, just the two chest pockets shown in the picture. Wore it for a brief hike in 45 deg weather with light rain and a breeze over a cotton t-shirt- worked great. I'm 5'9', 175lbs, 40" chest and broad shoulders, and the M fits well. So 4.5 stars, overall a great piece. Should be great for trail running, hiking, xc skiing, biking, etc.