Long distances call for sweat-wicking, quick-dry materials, and this shirt's lightweight, (100 percent recycled!) polyester fabric delivers. Flat, off-set seams help prevent chafe, and Polygiene odor control technology helps keep you stink free. The Fore Runner also features built-in UPF 15 sun protection and reflective logos to help keep you visible at night. Available in men's and women's sizes. ($39; patagonia.com)