This is a button-down shirt from Gymphlex made of cotton-silk material. It has a slightly wide silhouette, designed to be worn casually as an overshirt. Although the size is listed as S, it actually fits like a size L. Upon close inspection of the collar, there is slight discoloration from wear. It's not very noticeable, but I'll mention it for clarity. This item has the characteristic light and comfortable feel of cotton-silk. The product number is #GY-B0074 CSB.