Don't ever get this shirt touch the hooks side of velcro. The hooks will surely latch on to the fabric and when you yank it away you'll see ugly pulled loops that ruin the shirt. Velcro hooks, or anything that might catch the tiny nylon weaves like burrs, thorny plants, the burned end of a nylon web belt, a roughened edge of bag or camera strap, etc., will harm this shirt. That means you can never use this on a hiking trip in the jungle or when working with rough wood, for example, which kinda defeats it purpose which is to keep you cool under strenuous activity. I made the mistake of wearing these daily around the house and now they look old and worn after wearing them once (I bought three). I should have stuck to my regular cheaper good old cotton shirts for home use and reserved these precious nylon ones just for when I do nothing else but work out.