According to the care tag, 50% cotton, 50% polyester. The 100% cotton claim is the only reason I bought it.
Great shirt I have ever shirt sleeve mechanic shirts you guys sell and love them all and I have 12 of your flannel shirts but I would have to say I prefer the short sleeves better.
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Milwaukee Leather MDM11669 Men's Black Button Up Heavy Duty Work Shirt | Classic Mechanic Work Shirt w/ Pockets