Nice well-made fleece. 300 weight very bulky under a shell, 100 not warm enough for under 30 degrees under a shell. I just wish it had the same sleeve liners as 100 weight fleece on TNF Phere 3-in-1 jacket, that one makes slipping in and out much smoother. especially when you wear a long sleeve shirt under it. This fleece also fit a bit tighter around the belly so keep that in mind. I am 5'-9" athletic 185. Bought a medium and it barely fit, but a large would've been too loose for my liking. Need to lose a few pounds!