This is the Work Shirt for men of action, who work outdoors or roam the wildest, hottest corners of the globe. It's got the high-performance fabric and function to handle any climate, any situation. The CoolPlus ripstop fabric is light yet tough, wicks away sweat far more effectively than cotton. Gives you UPF 50+ protection to effectively block 98% of the sun's damaging UV rays too. Mesh insert panels in the bi-swing back deliver extra cooling power. The clever pockets help you stash all your stuff and keep it secure. (Don't want your treasure map falling out now, do you?) And, like most Duluth Shirts, the F.O.M.™ (Freedom of Movement) features let you work or travel comfortably.