Both, and it depends on the style. A number of pieces in the collection are 100% cotton, including organic cotton T-shirts, printed sweaters, and embroidered blouses. Others use cotton blended with modal, Tencel, or acrylic to achieve specific results: a cotton-modal gauze blouse drapes more softly and resists creasing, a cotton-Tencel ribbed tee adds a little stretch and a smoother feel, and a cotton-acrylic crochet top holds its texture better over time. The variety means you can find the right cotton top for what you actually need, not just what happens to be on the rack.