This short is designed specifically for the USA Players and staff for gym and running sessions. Made of lightweight nylon and cut exactly like our match shorts, it outperforms any other short when it comes to running. Deep pockets for whistles, keys, etc. A gussett is built into the crotch for superior comfort and leg movement. Mesh panels vent the heat from the lower back and leg area. Stretch panels in the thigh let the short move as you do.