None of them are hemmed, because they don’t fray. If you’re worried about it, try gently rubbing at the edge of it. Threads won’t come off in your hand either. Microfiber is just the size of the thread used, these are 100% polyester and completely machine washable.
Look in your area for a shop that does ready-to-wear clothing alterations. Sometimes dry cleaners will offer those services. Altering a dress shirt to fit you better is a relatively inexpensive service and then you don’t have to worry about this anymore. As a 6’ tall woman, this is literally one of the reasons I learned to sew.