Keep water adventures simple with one board, one bag and one shirt. The light Patagonia R0 Sun short-sleeve T-shirt thrives in and out of the water with a loose fit, sun protection and odor control. Polyester/spandex jersey offers comfort and performance in hot and humid conditions; it features 50+ UPF sun protection and Polygiene permanent odor control Got the description from REI. Used this a few times paddle boarding but really wasn’t for me. Been in’s tire for a couple of years and in great conditions.