Hair is an outgrowth of filamentous cells, containing keratin, that grows from follicles found in the dermis. The human body, apart from the palms of the hands and soles of the feet, is covered in follicles which produce thick terminal and fine vellus hair. Most common interest in hair is focused on
hair growth, hair types and hair care but hair is also an important biomaterial and the hair follicle is a well studied biological organ. Found exclusively in
mammals, hair is one of the defining characteristics of the mammalian class. Although other non-mammals, especially
insects, show filamentous outgrowths, these are not considered "hair" in the scientific sense. So-called "hairs" (trichomes) are also found on plants. The projections on arthropods such as insects and spiders are actually insect bristles, composed of a polysaccharide called chitin. There are varieties of dogs, cats, and mice bred to have little or no visible fur. In some species, hair is absent at certain stages of life. The main component of hair fibre is keratin
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