From the Orvis website: A quick-drying cotton-rich stretch blend, our River Guide Shirt does it all from fishing, hiking, and paddling to poking around the farmer’s market or cheering on your MVP from the sidelines. A modern take on the classic angler’s shirt, it has hidden mesh vents on the back to keep you cool, UPF 30 sun protection, and a built-in sunglasses cleaning cloth to keep shades or phone spot free. Ideal for travel, too, it has hidden zip chest pockets to hold a room key or credit card and OutSmart® Fresh odor control for multiple wearings before laundering. Finished with figure-defining princess seams and our signature embroidered mayfly logo. Active Fit, shaped to contour your figure without restricting. Cotton/nylon/spandex. Washable. XL(18-20); about 26" long Lightweight cotton-rich fabric dries in a flash Roll-tab long sleeves convert to short for changing weather Concealed mesh ventilation for cool comfort UPF 30 protects from the sun Hidden zip chest pockets keep essentials close at hand Cleaning cloth in the hem keeps sunglasses or phone spot free OutSmart® Fresh controls odor, perfect for multiple wearings on road trips Active Fit, shaped to contour your figure without restricting