User Review: Arc'teryx Rho LT Zip
Fabric: Rentex powerflex (stretchy synthetic)
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 turtle neck.