Ariat Mens Silver Fox Greater Arm Mobility Mositure Movement Technology Helps Keep You Dry Durastretch Fabric 55% Supima Cotton, 30% Modal, 8% Polyester, And 7% Spandex Base Layer Shirt 10033209The perfect lightweight layer for everything from keeping cool and covered on hot days to bundling up against the chill, this FR baselayer works all year long. Flame-resistant and moisture-wicking it packs a punch wherever you wear it.