Speedo Men's Hydrovolley Swim Trunks w/Compression Jammer, Black, Large Outer Shell Short: 100% Polyester; Inset Jammer: 80% Nylon/20% Spandex Imported Comfortable, quick drying and super lightweight rip stop fabric to resist tearing or ripping Built in compression jammer attaches smoothly at waist Mid length 19 inch outseam for fit mid-thigh or above the knee,fabric Outer Shell Short 100 percent Polyester/Inset Jammer 80 percent Nylon/20 percent Spandex UV block the burn with UPF 50+ offers tighter knit fabric for higher level of sun protection Made by speedo, the world's premier aquatics brand