Enjoy a relaxed, yet spirited look with this Washington Nationals Slack Tide Omni-Wick Button-Up Camp Shirt from Columbia. This polyester button-up features Omni-Wick technology, pulling moisture away from the body so you stay dry and comfortable all day long. Plus, Omni-Shade UPF 50 provides an extra layer of protection, using modified fibers to block harmful UV rays and keep your skin safe under the sun.