US Blanks US2900 Men’s 5.8 oz. Long-Sleeve Thermal Crewneck 100% cotton 30’s baby thermal; Heather Grey is 90% cotton, 10% polyester; Heather Charcoal is 50% cotton, 50% polyester ; This fit is leaner and long for layering; Sideseamed for a better fit; Made In USA; Reverse cover stitch on seams ;