Rating: 5 / 5
I own two, in red and zinc colors. These two shirts have proven to be astounding, do-everything tees, with all the non-stink and sustainable-farming properties we're undoubtably aware of. I opted for these after having been impressed with Patagonia's Wool 2 zip-neck long-sleeve...despite differing wool densities, they really are quite similar in fabric weight and feel, although the Icebreaker Superfine 140 admittedly feels more bombproof...and, in my subjective opinion, looks a fair sight better.
I find that when the shirt wets out with sweat, it becomes unevenly heavy, but this has little effect on actual performance. When I soak the front through on big pushes uphill in high temperatures (70's through the 90's), it winds up drying almost completely on the downhill as long as I am facing the sun. I have yet to have one to succumb to the "wool grinder" that is Velcro, despite their light weight. I've gotten some pilling here and there, but nothing short of my two cats' claws, willfully used, can cause these shirts to lose performance or aesthetic value.
I have a decade of synthetic shirts that I am noe eyeing with suspicion and disdain because of these shirts. Highly, highly recommended (as are the Mako Zip from their Skin200 line, or the Slalom Zip from their BodyFit260 line).