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The cuticle is responsible for much of the mechanical strength of the hair fibre. It consists of scale-shaped layers. Human hair typically has 6-8 layers of cuticle. Wool has only one, and other animal hair may have many more layers. Hair responds to its environment, and to its mechanical and chemical history. For example, hair which is wetted, styled and then dried, acquires a temporary 'set', which can hold it in style. This style is lost when the hair gets wet again. For more permanent styling, chemical treatments (perms) break and re-form the disulphide links within the hair structure.

The diameter of a human hair ranges from about 18 µm to 180 µm. In people of European descent, blond hair and black hair are at the thinner end of the scale, while red hair is the thickest. The hair of people of African descent is typically thicker than the hair of other groups.

The speed of growth is roughly 10 cm/yr = 0.3 mm/day = 3 nm/s. The cells at the base of the hair follicle divide and grow extremely rapidly. This is why people under chemotherapy sometimes lose their hair; the treatment targets any rapidly-dividing cell, not just the cancerous ones.

  • Hairz Online
    Offering human hair and synthetic hair wigs, weaves, braids and hair growth products.
  • Herbal Care New Zealand
    Organic products for weight loss, hair growth, and to stop smoking.
  • LazrSmooth Studios
    Services include hair removal, human growth hormone replacement therapy, facial contouring therapy, chemical peels, and European shaving technique and accessories.
  • California Pacific Research, Inc.
    New Generation hair care systems to promote healthy hair growth without drugs and potential side effects.
  • Unbalding: Hair Today, More Tomorrow?
    by Susan L. Narod. Hair growth products overview, causes of hair loss, hair transplant surgery.