I have the long sleeve version in the navy color. I don't like the performance shirts that stick to you like Teflon on a pan; I like to have them a little loose on me. I couldn't find anything like that in long sleeve until I came across the Justo Trek.
First off, I've never worn a shirt like this! Quite an amazing product. It feels very, very comfortable, and I wore it on a day here in northern FL where it was very warm recently. But the long sleeve wasn't really an issue; I kept it down pretty much the whole time. The only times I pulled them up a bit was b/c I didn't want to feel the sleeves around my hands. This thing didn't even really smell at the end of the day either, which is testament to the Chitosan antimicrobial feature. And it is VERY stylish. Got a compliment on it the first day i wore it. I bought a short sleeve one last night online and plan on buying more long and short sleeve versions of this.
If you are in the market for a performance shirt that looks and feels great, GET THIS ONE!