DetailsShell: 86% polyester, 14% elastane. Interior short: 88% polyester, 12% elastane.Machine washable.Tab with our signature pony at the right side.Elastic waistband with an interior drawstring. "ThermoVent" graphic at the back left waist.Perforated sides. Back right zip pocket. "Polo Sport" rubber-printed at the hem of the shell and interior short.Vented hems.Interior compression short.Imported.Ralph Lauren is proud to be an official sponsor and the official outfitter of the US Open.