Heather OMNI-SHADE: Columbia Men's Thistletown Park Long Sleeve Crew Shirt features our signature UPF 15 fabric that helps to blocks harmful UVA and UVB rays as well as wicking technology to help keep you dry and cool on the trail. OMNI-WICK: The ultimate moisture management technology for the outdoors. Omni-Wick quickly moves moisture from the skin into the fabric where it spreads across the surface to quickly evaporate—keeping your body warm and your clothing dry. COMFORTABLE FABRIC: 67% polyester and 33% cotton blend is soft on the skin and allows for a comfortable fit. VERSATILE STYLE: A crew neckline and long sleeves make this shirt versatile enough for layering, or everyday casual wear. BUILT TO LAST: Our signature Columbia logo is your assurance of our attention to detail. It's what sets our apparel apart from others. We use only the highest quality materials, expert craftsmanship, and durable stitching. This is a reliable garment you will enjoy for seasons to come.