Hanes Boy's X-Temp Camo Thermal Set 60% Cotton, 40% Polyester (Heather Grey 55% Cotton/45% Polyester) Made in USA or Imported environment and activity to keep them cool and dry for all day comfort How? X-Temp&#153; technology adapts to temperature environment and activity to keep them cool and dry for all day comfort Soft waffle knit thermal cotton-rich fabric