Thank you for viewing. This is a Montbell Shammy Jacket. It's made of a densely woven material of ultrafine microfibers. Despite being thin and lightweight, it traps a lot of air between the fibers. It has a good balance of warmth and breathability, effectively expelling sweat vapor even in high-activity situations. It is quick-drying. The fabric surface, with its short, brushed ultrafine fibers, is very soft and smooth. The size is women's M, with a body width of 48cm and a length of about 56cm. It has been used, but there are no problems with wear. It's a convenient jacket for autumn as an outer layer and for winter as a mid-layer.