I wanted a lightweight but warm layer to wear underneath my clothing at my (very cold) office. Silk is a wonderful thermal layer -- very light, comfortable on my skin and incredibly warm for its weight. The sizing I'd say is true-to-size, and the quality is excellent. My only complaint is that I wish the "scoop neck" on this shirt was just a little lower because I can see the edges peaking out from under my open-necked shirts. The neck opening is much lower than a crewneck-style shirt, though, so for most people I imagine it would be perfect.