This 100% heavyweight cotton jersey knit sleeveless muscle shirt will be your daily go-to, alone or as an undershirt. With a single chest pocket, a tagless label for comfort, and a spacious fit for all kinds of work activity, this basic will become a wardrobe staple in any situation. Jersey knit, 100% pre-shrunk cotton. Heather gray is a cotton-polyester blend. Features: Spacious fit for all kinds of work activity, single chest pocket, tagless back neck label for comfort, soft and durable. Material: Cotton.