Yamato Michi Bamboo Shirt Light blue long-sleeved shirt, comfortable with a rayon and polyester blend. - Material: 50% Rayon, 50% Polyester (Bamboo Polyester) - Color: Light Blue - Style: Long-sleeved shirt - Size: UNISEX S Thank you for viewing. Purchased from the official website several years ago. I bought it wanting to wear it tight, but the size didn't quite fit, and I've worn it less than 10 times. Only for casual wear in the city. There is some wear on the collar, but it's not very noticeable.