Algiert-Zielinska B, et al. - This study inspected the epidermal barrier efficiency via the estimation of the following values: The lipid coat, the transepidermal water loss (TEWL) index and pH. The data displayed that in the T-zone, a thinner lipid coat caused considerably high TEWL and pH levels changing toward alkaline. The thinner lipid coat was accompanied by lower TEWL and pH changing toward alkaline, in the U-zone. Lower values of lipid coat up to 100 μg/cm² exhibited a correlation with higher pH values ranging toward the basic character pH 5.6-9.0).