Medium fine weight with a bit of stretch vest, slim enough to wear as a single layer or layer over tees, thermals or shirts - tubular neck trim, washed lush texture and a rib knit bottom, absolutely the coziest piece for cold days. Made in Peru of 65% alpaca, 28% merino and 7% lycra. Shown with the Pamela Mayer paper bag waist skirt. Jo is a size medium and is wearing the size 2, fits comfortable and follows the body. Hand wash cold, lay flat to dry.