This short-sleeved button-up is made with a highly breathable, air permeable fabric with cooling technology, durable flat-felled seams and a single chest pocketa "a warm-weather staple for any outdoor lover. A lightweight, packable material and construction makes this an ideal piece to throw in the weekend warrior duffle whether the trip takes you to the California coast or the dry, dusty desert. 100% Polyester Plain 2.5 ozyd. Bluesign Approved Fabric. Air Exchange Performance Fabric. Cooling Technology. Packable, Air Permeable, Lightweight Fabric. Ultraviolet Protection Factor (UPF) 25. Durable Flat Felled Seams. Shirt Tail Hem and Single Patch Pocket. Regular Fit. Weight: 0lbs 4.8oz (136.1g).