From the manufacturer:
The velvety matt finish allows for a high level of detail, similar to that of a pencil. The paper is Acid Free, ecological, and made from 25% cotton fiber and lignin-free cellulose pulp. Studio Watercolor Paper is FSC® certified and produced using hydropower, which significantly reduces emissions of greenhouse gases in the atmosphere. Ideal for watercolour, gouache, acrylic, ink, drawing and mixed media.