Nike Challenger 7 inch Men's 2-in-1 Running Shorts. LIGHTWEIGHT, BREATHABLE SUPPORT. The Nike Challenger 7 inch Men's 2-in-1 Running Shorts strike the ideal balance of coverage and breathability. Their inner shorts give comfortable support, while the mesh panels on the outer shorts help keep you cool as your route heats up. Nike Dri-FIT technology helps you stay dry, comfortable and focused.