Arc'teryx Men's Rho LT Zip Neck

It fits well, is well constructed, looks good, and best of all, does the job to keep you warm. I had this on with only a Hawaiian shirt at 8500 ft in the snow and was plenty warm. I also like the fact that they treat it with silver-ion something so that if you sleep in it, the treatment keeps odor causing bacteria at bay. That's a handy idea.

I've been using a silk top up to now (and still do on occasion) but this top is a nice alternative for cold weather warmth. The cuff length is good, the material is not fragile, and I like the front zip that allows you to regulate heat a bit more than having "only" a crew neck or "only" a turtleneck.