These shorts are designed to look like a pair of run shorts layered over compression shorts. The main shorts are made of woven poly with a tulip cut and a stretch waistband for a nice fit. The undershorts are made of stretch poly jersey knit fabric with a snug yet comfy feel. Both parts of the shorts are enhanced with quick-drying, moisture-wicking Dri-FIT technology to help kids stay cool and dry while they play.