Healthy Hair: What Is it? Rodney D. Sinclair  Journal of Investigative Dermatology Symposium Proceedings  Volume 12, Issue 2, Pages 2-5 (December 2007) DOI: 10.1038/sj.jidsymp.5650046 Copyright © 2007 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 1 The f-layer – 18-methyl eicosanoic acid is intimately bound to the exo-cuticle and intensely hydrophobic. Journal of Investigative Dermatology Symposium Proceedings 2007 12, 2-5DOI: (10.1038/sj.jidsymp.5650046) Copyright © 2007 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 2 Healthy hair as evinced by shine and body. Journal of Investigative Dermatology Symposium Proceedings 2007 12, 2-5DOI: (10.1038/sj.jidsymp.5650046) Copyright © 2007 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 3 A significant degree of weathering to the hair shaft. Most weathering is self-inflicted. Journal of Investigative Dermatology Symposium Proceedings 2007 12, 2-5DOI: (10.1038/sj.jidsymp.5650046) Copyright © 2007 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 4 Cosmetic products restore the optical and physical properties of hair after weathering. 960 × 1458mm (72 × 72DPI). Journal of Investigative Dermatology Symposium Proceedings 2007 12, 2-5DOI: (10.1038/sj.jidsymp.5650046) Copyright © 2007 The Society for Investigative Dermatology, Inc Terms and Conditions