Made of 90% nylon and 10% spandex., the shirt has the perfect amount of weight and stretch to make it your favorite shirt. We designed this short-sleeve shirt with the fisherman in mind, simple pocketing, vented back and a quick-drying fabric. Cooling 4-Way Stretch Water-Repellent Anti-Microbial (Prevents Odor) Lightweight Back Yoke Vent with Mesh Insert to Keep You Cool Wash & Wear Machine Wash, Do Not Bleach and Tumble Dry Vented Back, Super-Lightweight and Soft Touch