I bought this windshirt on a whim being told by a few sources that once you have one, it will become a staple for your backcountry trips. I just got back from a four-day backpack in the Smokeys in North Carolina and took the DriClime instead of my normal polar fleece, and I can honestly say I am a believer now. At first, I thought the shirt looked kind of funny. I had a shirt in the 80's that felt similar (fabric wise only) to be honest. But trying to be open minded, I gave it a shot. Bottom line, it blocked the wind well in the mountain passes, it takes up less than 1/2 the room in my pack as my fleece did, and it seemed to be equivalently warm.