Similar to the TKA 100 Glacier Microfleece
Have two of these (one purchased on Backcountry, one was a gift -- also from Backcountry) and I chose them because they were supposed to be like the TKA 100 Glacier MicroFLEECE pullovers. They are a bit softer and they appear thinner/lighter, but still keep me nice and warm, the perfect temperature. It is still fleece; it is not like those velour tops of yesteryear. :-)
The fit is similar to the microfleece, perhaps a smidge roomier and longer. The sizing chart is fairly accurate. I'm 5'3" and 120 lbs. with an athletic frame and I find the Medium to work well. It's a little loose if worn alone, but there's room to layer underneath for greater flexibility.