liz4669710wrote a review of Smartwool Merino 250 1/4-Zip Top - Women's on January 31, 2018
Familiarity: I've put it through the wringer
Fit: True to size
Although this is considered a base layer, it is thick enough and attractive enough to wear as a sweater although I'll often wear a vest or flannel shirt over it. I have quite a few of these in different colors and wear them every day in the winter. The v-neck zipper makes it versatile. It's very warm when zipped all the way up and cools you off when lowered.
Because it is washable I also wear it to work in the garden when it's chilly. I wash on cold and hang to dry. The one I've washed the most shows pilling but still looks good. It doesn't need washing as often as other fabrics because it seems to not pick up odors as much.
Regarding sizes, I wear a medium in most tops. The large has the looser fit I'd want as a stand alone sweater and the medium has the close fit I'd want in a base layer to avoid bulk. I have both sizes and wear both of them as stand alone and base layers. Because it stretches there isn't a huge difference. These come in great colors. The one I just bought is charcoal and it is a beautiful rich color with a bit of a sheen to it.