Callaway Men's Golf Cooling Color Block Shorts Sleeve Polo Shirt 56% Polyester, 44% Outlast Polyester Imported Callaway tour logo on left sleeve Outlast technology enhances textiles by providing the benefit of proactive temperature regulation that manages heat and moisture It adapts to thermal changes absorbs excess heat deduces overheating chilling and perspiration Opti-Dri transfers moisture away from the body to help in evaporation Opti-Vent fabrics allow for the garment to have maximum breathability Opti-Cool cooling technology factors in the fabric transfers heat away from the body and keeps the garment cool to the touch