NIKE Running Flex Challenger 7 Inch 2-In-1 Shorts (XL, Grey) Nike Flex fabric stretches with your body for a comfortable, unrestricted fit. Sweat-wicking inner shorts help you stay dry with extended coverage. Perforated side panels enhance breathability to help you stay cool. Inner attached shorts help wick sweat and provide snug, comfortable support. Drop-in waistband pocket holds small items and hand pockets for additional storage.