These Premium Men's Dri Fit Performance Short Sleeve T-shirts are great for working out. They wick away the sweat just as advertised. The fit may run small, but they are stylish and come in a variety of wearable colors. I love that the fabric on the back matches the side fabric cutouts. They are well made and do well in the wash also. My husband has a 39" chest and the Large fit him just right. He usually wears size Medium, but I think Mediums would have been too small/tight in this shirt, so size up, especially if you're in between sizes, unless you like a tighter fit to workout attire. If you prefer a tighter shirt, purchase your usual size.