It feels smooth because it's cotton-filled, but it's like a thick knit top. I think you can wear it in winter by adjusting your undergarments, such as Heattech. It's not all stripes, so I think it will be useful for both casual and smart looks. Beige-toned white x navy stripes. I think the size is men's S, but it's about a women's M size. I think it's in a clean condition, with no noticeable stains.