Don't know why this as classified as a shirt because this is one serious fleece. Its very lightweight but incredibly warm, especially for its thickness. I was very surprised by just how warm this fleece is. When I'm just lounging around the house in this with just a t-shirt underneath I usually get too hot.
The fit is slightly relaxed. I'm 5'11, 145lbs and the medium fits me nicely. The arms are just perfect for me. The backcountry.com pictures are a little misleading. This fleece has more of a sweater look than the Patagonia R1 look that the pictures would have you believe. Still, a very stylish pullover that is probably worth the $120.