Took them to the gym for a workout and came home with a few hooks on the fabric. I kept trying them and came home with new hooks each time! Couldn't figure out which machines are causing problems. After about a dozen rides, I finally found that the Velcro straps on my training gloves were causing them to stick. When the hook and loop side touched the fabric that much, it caused a snag! The shirts looked good, fit well and breathed, but the open fabric is so prone to snagging that they are unusable. I have already bought a replacement in knitted polycotton.