UA RUSH™ is infrared technology that reflects your body's energy to help you work harder & recover faster Super-soft ColdGear® fabric on back & sleeves is breathable & stretches for superior mobility Diamond-textured fabric on front with brushed interior for added warmth & comfort Mock neck construction for added coverage Built-in thumbholes help keep sleeves in place & trap heat Ribbed collar, cuffs & bottom hem - Style #: 1366168 Powered by Celliant Back Body/Sleeves: 84% Polyester/16% Elastane Front Body: 78% Polyester/22% Elastarell Imported - Machine wash cold with like colors Use only non-chlorine bleach when needed Tumble dry low Do not iron Do not use softeners Do not dry clean