The Heavyweight Tee. Introducing the heaviest tee on the market. Clocking in at 9oz per square yard (305 GSM), this heavyweight tee stands alone. It feels tough as hell, just like the city we call home. Our tees are made with 100% USA cotton and cut in a boxy fit that feels like a classic work tee. The fabric has a structured hand that holds its shape while it breaks in with every wear. Manufactured in Detroit by our team of exceptional sewists.