On your mark.Get set.GO! Made to last swim after swim, these Nike HydraStrong swim briefs are made with cholrine resistant fabric.An interior lining and a drawcord at the waist keep this suit distraction-free, so you can focus on your strokes.boys swimwear, boys swimsuit, square leg swimsuit, square swim trunks, boys competition swimwear, competition swimsuits, racing swimsuits, performance swimwear.Body:51% recycled polyester 49% (PBT) polyester (Chlorine Resistant).Lining:50% recycled polyester 50% polyester.Nike HydraStrong fabric provides long-lasting durability, swim after swim.Adjust the interior drawcord for your perfect fit.Internal front lining adds security.Flat seams are designed to reduce chafing.