Historically, the hair surface was thought to act as a hydrophobic barrier to foreign agents and a boundary lubricant between hair fibers . When hair is damaged, it was hypothesized that exposure of a hydrophilic surface would promote water adsorption . It is now known this is not true as undamaged hair fibers have been shown to absorb moisture, in excess of 20 % wt, when exposed to humid conditions . Bildstein et al. further explored the effects of subcellular lipid distribution in hair fibers on moisture uptake and found that endogenous lipids do not act as a barrier for water . With this information in mind, we simulated the different hair models in the presence of water to study the fatty acid rearrangement at the surface.