Pottery Barn describes as: Woven from the world’s finest Belgian flax, our linen bedding is prewashed for incredible softness—and only gets better with time. Lightly textured and cool to the touch, this natural-fiber fabric is prized for its durability, breathability and lived-in look. Our Belgian flax linen bedding is proudly made at a Fair Trade Certified factory. Front is woven from 100% Belgian linen; reverse is 75% cotton and 25% linen. 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. STANDARD 100 by OEKO-TEX certified. Tested in an independent lab and verified to be safe from over 350 harmful substances. Fair Trade Certified. The purchase of this product helps ensure fair and safe labor practices, improve livelihoods, and empower workers to invest in their communities. Duvet features a hidden button closure with inner ties that keep insert in place; sham features an envelope closure. Duvet cover, sham and insert sold separately. Pre-washed for a super soft hand feel. Machine wash. Imported.