96% Polyester/ 4% Elastine Fishing Guide Shirt. The Bowline Features a SPF rating of 80, with an Additional Antimicrobial Coating to Keep You on the Water Longer. Ample Double-Walled Pockets to Fit all your Gear, Slots and Hooks for Zingers. There are Vented Armpits, a Vented Back with Mesh Liner, Laser-Engraved Buttons, and Custom Labeling. Oh, and a slot for your Forcepts on the Left Bicep. We're probably Forgetting a Feature. This thing's Loaded.