This is an M-size undershirt purchased from MUJI. Measurements: Width: 37cm Length: 54cm Shoulder width: 39cm Sleeve length: 54cm Color: Black. The tag is printed directly on the garment, which is recommended for those who find tags irritating against their skin. Material: 90% cotton, 10% wool. I'm selling this because the M size has become too tight for me. I accidentally put it in the dryer once, and it seems to have shrunk slightly. It might fit someone who usually wears a size S. Please refrain from purchasing if you are concerned, as this is a used item.