This black Ulla Johnson tie-dye puff sleeve sweater is crafted from cotton. It features a round collar with button placket, puff sleeves, ribbed trims and tie-dye detailing throughout. The shade of this Ulla Johnson sweater is called 'Obsidian,' which is also the name of a stone said to ward away negative energy. Seems fitting, as we've received nothing but positive feedback since wearing it.