The Women's Patagonia Long-Sleeved Self-Guided Sun Shirt is comfortable, lightweight, quick-drying recycled polyester plain weave with 40+ UPF sun protection and mechanical stretch for easy movement. The two drop-in chest pockets with button closures keep small essentials. The open venting across the back and shoulders increases airflow for cooling comfort in steamy weather. The extended hem stays in place while casting, rowing, or hiking to enhance comfort and sun protection, and the shirt won't bunch or ride up when worn with hip packs. The double-layer collar converts to a stand-up collar for additional sun protection, and hidden snaps at the collar points eliminate flapping in the wind. An integrated, intuitively positioned, easy-access lens cleaner is sewn in at the front hem to ensure clean optics without having to search for the lens cloth.