Polartec Running Shirts

Running is more comfortable with the right clothing. This article highlights fabrics and features for warm weather and winter running.

Find the best running shorts for any activity. From trail runs to marathons, we've rounded up our favorites, based on input from REI Co-op staff.

Planning to run 26.2 miles in over five hours? Here are some training and racing tips to set you up for a positive marathon experience.

Thinking about running a marathon? This article will help you get started with tips on training, hydrating, fueling and more.

Learn how to select and prepare for your first trail ultramarathon, with tips on nutrition, hydration, mental and physical prep and more.