Enimay Men's Striped Athletic Polo Collared Casual Short Sleeve Shirt Tennis Golf Casual Wear Athletic Short Sleeve Polo Shirt / Tight Sleeves 65% Polyester / 35% Cotton Machine Wash Cold / Do Not Bleach / Tumble Dry Low / Warm Iron When Needed Shirt may have visual yellow marks on stitched and hemmed areas to help prevent fraying, they WILL wash out. Factory fraying may occur, a simple cut will suffice.