Amazon states in its description that the cap is machine washable at 30 ° C. However, the label sewn under the cap indicates that it is not machine washable, or even by hand (logos crossed by a cross). Only the "cleaning sponge" is allowed. I bought this hat specially to be able to regularly wash machine unlike the ones I already had. I have chosen white for peace of mind. And here I am now well underway! Otherwise, she is very pretty, well cut and well finished. I'll keep it and try to wash at 30 ° C when it is really necessary. Because wash white cotton cap with a sponge, I do not really feel it. Besides I wanted to spend the machine to wash the sweatband after the beach, etc.