They prevent the growth of odor-causing microorganisms  They do not prevent the skin from breathing and perspiration, they do not act as an anti-perspirant  They don't stick  They do not leave stains on clothes  Without Aluminum Chlorohydrate, preservatives and alcohol  Suitable for all skin types  Instructions for Use: Wet the top of the crystal with water before each use. We apply to clean skin, armpits and other parts of the body that we wish to protect. External use.