Pottery Barn describes as: Lustrous, smooth and cool to the touch, our Belgian Flax Linen Duvet Cover is woven from fine Belgian flax. It is enzyme washed for added softness, and its classic style complements a variety of patterns and styles. Linen woven from 100% Belgian flax. Breathable Belgian flax linen is ideal for warm or cool temperatures, and its durability lets you love it for years. Soft and cool to the touch. Microscopic breaks in the fabric provide a light massaging effect, and high absorbency meaning they'll always feel fresh and cool. Oeko-Tex certified, the definitive mark of excellence for products that are healthy for you and healthy for the environment. Fair Trade Certified products ensure fair and safe labor practices, improved livelihoods and empower workers to invest in their communities. As a proud member of the Fair Trade USA network of brands, we pay into a Community Development Fund for every Fair Trade Certified product sold so that a worker committee can collectively invest in projects of their choice. Duvet features a hidden button closure with inner ties that keep insert in place; sham features an envelope closure. Pre-washed for a super soft hand feel. Machine wash.