Cleaning instructions: machine wash when required, in cold water, hang to dry, do Not use a dryer, reshape and if desired, press while damp with hot iron. About the fabric: Unbleached cotton: plain weave 100% cotton, vegan friendly, - known as "muslin". Muslin was brought to Europe from the Middle East in the 17th or 18th century. But it was discovered earlier by European travelers including Marco Polo in the early 13th century. The fabric was used for bandages in World War I and the Wright Brothers used it as covering for wings and control surfaces on their gliders and the 1903 Wright Flyer. Muslin is also used as a filter in food production to separate particles (i.e./ cheese making, decanting fine wine) and Beekeepers use it to filter melted beeswax. Fabric has been prewashed.