84% Polyester, 16% Spandex Made in the USA or Imported USE CASE: This comfortable compression shirt is exactly what you want for layering on cooler days and nights. Also great for walking, jogging, hiking, biking, and more. SOOTHING COMPRESSION: Proprietary 4D stretch fabric helps soothe everyday aches and pains with gentle compression of your muscles and joints. And when worn under layers, compression can provide a slimming and flattering appearance. ALL-DAY COMFORT: Proprietary 4D stretch compression fabric delivers unrivaled stretch and recovery, for compression clothing so comfortable you'll want to wear it all day. With UPF 50 for added sun protection. ODOR CONTROL: Patented Copper Znergy fabric technology provides increased odor control. It's 100% infused into all of our garments and won't wash out. WICKING & BREATHABLE FABRIC: Designed to wick sweat and breathe well, so you stay dry and comfortable throughout the day.