These are great, well-made handkerchiefs! If you've seen my review of organic cotton handkerchiefs then you know I have a problem with my ironing board. . Mostly it's a friendship where he stays in his part of the house and I in mine. Fortunately, while other tissues require a gentle touch of a hot iron, this is not the case. I say they don't "require" it. They have slight creases right after drying, but nothing to cause them to warp. Bamboo flannel almost completely does not wrinkleβ¦