Got this shirt to deal with the hot days and it battles the heat very well. The shirt is lightweight, highly breathable, and wicks very well. My only complaint would be the fabric matched with a hydration pack. The fabric isn't abrasive on the skin or to touch, but for some reason, when wearing my hydration pack on those long trail days, the shirt tends to migrate up my back. I can only guess its the fabric, since my Arc'teryx Actinium shirt doesn't do this and that shirt is more of a silky material. But, sans the hydro pack, this shirt is great.
Does great in a humid midwest climate. I absolutely love it, the cognac is not quite neon but bright enough to be seen running/biking on the road. Material is not SUPER soft, but I have never felt any abrasion. Overall its incredibly comfortable and I wear it just about every other day in the summer, also the neck is a little bit closer fitting versus the velox comp which is a little loose - Probably the most underrated fabric that arcteryx uses, I sincerely hope they continue to make this shirt and in more awesome bright colors
If you sweat, or are in a humid area, and want a shirt that does not cling AT ALL, is durable, featherweight, gives UV protection, can be washed and wrung out near "wearable dry" then look no further. This is BY FAR my favorite technical tee, and I have tried a bunch. Fabric is bullet proof,holds up in chimneys, and incredibly breathable. THIS is the shirt!!! Get one..really just do it now!