US Flag Challenger Running Short by BOA. Great way to show your patriotic pride and freedom loving spirit. This US Flag Challenger Short is made from 100% Microfiber Micro Pro Polyester fabric; soft, comfortable, and quick drying. The side leg panels are made with 98% Polyester/2% Spandex for breathability, stretch, and freedom of movement. A perfect combination for total running pleasure. Other features include; quick drying and comfortable internal brief, sculpted side leg venting, elasticized waistband, internal security pocket.