Floso Mens Interlock Underwear T-Shirt Cotton, , Mens T-shirt undergarment. Size (to fit chest): S: 36-38in (91-97cm), M: 39-41in (99-104cm), L: 42-44in (107-112cm), XL: 45-47 (114-119cm), 2XL: 48-50in (121-127cm). 100% Cotton. Machine washable at 40c.