Here's what other sites are saying:
Perfect for cold weather, the women's REI Powerflyte tights are ready for aerodynamic action. Active fit with 4-way stretch is perfect for cool-weather outdoor training, and it also works great as a base layer in warm weather. Very comfortable fabric features a moisture-wicking brushed inner face and a smooth outer face. Fabric protects skin from too much UV light with a UPF factor of 50+. Elastic waistband with adjustable drawcord offers an extremely comfortable fit. You'll go farther without discomfort thanks to flat seams placed to work with your stride. Reflective logo. The women's REI Powerflyte tights feature an envelope pocket to store accessories.