“…The shaft has a smaller diameter, thinner cuticle, and is drier (lower water and sebum content), with lower tensile strength, which favors breakage. 1 Several extracellular matrix proteins and adherens junctions are decreased, 16 , 17 leading to differences in hair texture, strength, and manageability. The follicular units commonly have hair shafts emerging together and the wavy fibers emerge at an angle to the scalp.…”