Keep water adventures simple with one board, one bag and one shirt. The light Patagonia R0 Sun 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 it a few times paddle boarding but really wasn’t for me. Been in storage for a bit and in great conditions.