This t-shirt is made from 100% polyester fabric that stretches and never shrinks; The fabric offers UPF 50+ sun protection, which is important for outdoor activities (like fishing) while sunbathing. The seams and folded edges are sewn well, without protruding threads and gaps. The sizing chart is accurate but lacks body length measurements (shrugs); Older athletes will likely opt for an oversized t-shirt as the light stretch material shows any bulge. There are no washing instructions, but I am confident that this 100% polyester t-shirt will hold up well in my "mens wash" (wash hot on constant spin, tumble dry on hot on constant spin).