From Naked and Famous Denim, the Circle Knit T shirt is a 9 oz jersey using ring spun cotton, a process that creates the finest and strongest yarns. Circular knit shape has no side seams. Black, white, navy are 100% cotton Heather Grey is 90% cotton 10% polyester for the heathered effect. Fit runs a little on the small side in men’s sizing. We recommend sizing up. Made in Canada.