This is a Ralph Lauren flannel shirt. A regular collar shirt that modernizes work details, suitable for layering or wearing as a single layer. It uses thin twill fabric brushed to achieve a soft, cashmere-like feel, and is a utility-style shirt finished with sheepskin elbow patches. I am selling this as I have never worn it after purchase and have no plans to wear it in the future. The size is S, which is equivalent to a Japanese M size. Thank you.