The Patagonia Men's Long Sleeve Sol Patrol® II Shirt is lightweight and versatile. Whether you're casting to brown trout or bonefish, this shirt provides protection from the sun's harmful rays with 30-UPF fast-drying polyester fabric. The double-layer collar provides additional sun protection for the back of your neck that can be popped up. Features comfortable mesh fabric to keep you extra cool at the back, sides and arms. Rolled-up sleeves can be secured with a tab for when you need to cast and release.