Great all around shirt. Great for training, hiking, biking, and even as a great night time sleep shirt. I have used this as a bottom layer for desert hikes, where I have worn a Solumbra long sleeve sun shirt over it. Wicks sweat very well, and dries super quick. Oh and if you chafe easily, then this is the best shirt I have ever had where I never come out with a rash, especially around where the shoulder harness rests. Just a super shirt.
Great Hiking Shirt and baselayer
I bought the Capilene-1 T shirt to be my primary hiking shirt for hikes in Florida and for backpacking trips on the Appalachian Trail. I've tried numerous other brands of synthetic, wicking T shirts, but the Patagonia Capilene 1 is my favorite. I've used them for hikes in temperatures from 50s to 90s. It serves very well as a base layer for cool weather, and as a wicking T shirt for hot, humid weather. For colder weather down into the 30s or 40s, I would go with the Capilene-2, which is also an excellent baselayer. I prefer the Cap-1 for warmer days and hot, humid weather. The fabric dries quickly from rain or perspiration, and is very lightweight. I'm 5'6", weigh 160, and the Large size fits me best. I recommend the Cap-1 shirts for backpacking trips also, the material and seams hold up well under backpack shoulder straps.
Cool Shirt for Exercise
Bought Capline 1 T-Shirt for exercising and warm weather hiking / biking. We won't have warm weather for a few months, but loving it for working out. The shirt run a bit smaller than a typical t-shirt. I'm 6' 2", 180 lbs with a slim build. A large is borderline snug, but very comfortable. These shirt weigh almost nothing and breath great. Don't know about durability yet (I'd keep away from loose Velcro hooks) but the build is great and I'm expecting years of good use. Looks sharp also.