When I ordered this shirt I thought I ordered a size up, but the shirt I received was small - too small for my body. Because I ordered it through the Vine program, I cannot exchange it for a different size. That's very bad, because it's a very good summer shirt for outdoor activities like hiking, fishing, boating, camping, etc. It's lightweight, breathable, UV protection, moisture wicking, made of "quick-dry" material and very attractive color (tan). The material is 88% polyester and 12% spandex and has a slight "stretch" to ensure a unrestricted fit. There are two attractive front pockets with velcro flaps. I don't see any flaws in the shirt and the seams are great. Unfortunately I have to give this shirt to my small and skinny teenage grandson, but I like it so much I'm going to order another one in a larger size.