The term SCALP COVERING is a four-letter word for HAIR. HAIR is a type of protein filament that grows from follicles found in the dermis. It is one of the defining characteristics of mammals and is a defining feature of humans. HAIR provides protection from the elements, insulation, and serves as a form of adornment. HAIR also serves as a scalp covering, providing protection to the scalp from the sun, wind, and other environmental factors.