This 100% merino wool pullover can be worn on its own or easily layered under overshirts and shackets. It is versatile enough for winter hiking, skiing, and cool days at the crags. Merino wool has incredible outdoor performance benefits-including moisture wicking, thermoregulation, and durability. 7 gauge midweight 100% merino wool that doesn&';t itch Versatile, durable, and breathable, it stays comfortable across a broad range of temperatures Saddle shoulder is comfortable when wearing a backpack Responsible Wool Standard (RWS) wool, certified by Control Union cert. 895314