NWOT Details Made from 100% flax linen. Breathable 170 GSM fabrication. OEKO-TEX® certified (so, no nasty chemicals). Finished with envelope closures. Natural and breathable, relaxed yet refined, these 100% flax linen king pillowcases effortlessly elevate any space while bringing you the sleep of your dreams. Ultra soft and incredibly durable, you’ll love the fresh, luxurious finish of these timeless essentials. The thing about linen is that it contains natural temperature-regulating qualities, and adjusts as the body’s temperature does; becoming lighter and cooler in the summer months and warm and insulating in the cold, softening with every wash and becoming more comfortable as time goes on. Just when you thought you couldn’t love your bed any more.