Cotolin, linen and hemp towels can be machine washed on a handwash or delicate cycle in cool water with a mild soap. While you certainly can put the towels in a dryer, I try not to use a dryer since use of the high heat often used in dryers will decrease the life span of any item. You can just hang the towel up to dry and iron it with steam on the linen setting. For a much easier ironing experience with linen, try to catch the item while it is still damp and you will find it much easier to iron out the wrinkles.