Quick dry, lightweight, Sandlon SPF fabric - breathable, water repellant wind resistant, sun protection. Paddle Shoulders® - unrestricted motion, seamless shoulder point eliminate bulk, irritation and fatigue, perfect for portaging, back packing, etc. Roll Up Sleeves - comfort and protection when needed. Secured roomy pockets - keep contents in place. Clean finished seams - add comfort, reduce irritation, increase seam strength. Vented floating back yoke - designed for comfort and air circulation. Underarm eyelets - added comfort and air circulation. Vertical Seaming - attractive slimming look, yet full cut comfort. Side Slits Button Down Collar.