100% cotton liquid-proof sheets and 1 pillowcase are sold as a set. The upper part is made of 100% first quality cotton fabric, the bottom base is made of 100% cotton mattress protector fabric. The pillowcase does not have a mattress protector. It does not cause sweating. It does not make any rustling noise. It is comfortable to use because the part in contact with the skin is cotton. It can be machine washed at 30 to 40 degrees. A dryer should not be used. It will make your life easier during the diaper-free period - for those who have sweating problems - for inpatients - during menstrual periods - during the postpartum period. If you want to put an end to yellow stains on your bed, do yourself a favor by choosing our sheets :) You can contact us for special size. I want you to know that you are supporting a female entrepreneur with your purchase :)