Wore this L/S shirt as my baselayer on a 10 day backpacking trip through the Collegiate Peaks in CO - temps from the 40's to 80's, two 14'ers, rain, snow, hail, and wind...this shirt was absolutely perfect. Dried fast, great cut, and didn't stink (too bad) after all the wear. My only minor gripe is the silly pocket on the lower left (too small for anything very useful but big enough that you know it's there).

Like most all Icebreaker stuff this shirt would earn a "5" based on its superior quality, materials, fit, function, etc. The one thing to note, however, is the pocket on this shirt. There's a small zip pocket on the left side at the hem. You can't really tuck this shirt in without this pocket bulging out very prominently above the waistline, looks ridiculous. The pocket is very small and wouldn't hold much anyway, not too functional; the shirt would be a lot sleeker and better fitting without it. Beyond that, its a very nice shirt as you'd expect from Icebreaker.