Journal of Cosmetic Science The Official Journal of the Society of Cosmetic Chemists 2021 Special Edition Contents Preface Trefor A. Evans | pp. 633 The Role of the Scalp Microbiome in Health and Disease: Malassezia, Friend or Foe? Thomas L. Dawson, Jr | pp. 634 What Causes Curly Hair? Marina Richena, Duane P. Harland | pp. 643 Mapping Protein Cross-Links in Human Hair via Mass Spectrometry Evelyne Maes, Jolon M. Dyer, Santanu Deb-Choudhury, Stefan Clerens | pp. 655 The Matrix Revisited S. Breakspear, Trefor Evans, B. Noecker, C. Popescu | pp. 670 Moisture in the Cuticle Sheath: Effects on Hair Mechanical and Cosmetic Properties Manuel Gamez-Garcia | pp. 687 UV Oxidation: Mechanistic Insights Using a Model System Jennifer M. Marsh, Stephanie L. Davis, Rui Fang, Monique S. J. Simmonds, Philip Groves, Victor Chechik | pp. 697 Physiochemical Properties of Textured Hair Roger L. McMullen, Timothy Gillece, Tyler Schiess | pp. 711 Enhanced Natural Oil Deposition Using Acrylic Copolymers Lyndsay Leal, Michaeleen Pacholski, Beth Johnson, Jennifer Koenig, Shannon Golden, Lu Bai | pp. 732 Influence of Ethnicity and Damage Levels on Fragrance Substantivity on Hair Rebeca M. Gasparin, Fernanda M. Thomaz, Carolina B. Lourenço, Adelino K. Nakano, Anita J. Marsaioli | pp. 741 Note: These proceedings have been edited only for conformity to journal format by the Society of Cosmetic Chemists. The text of the articles is presented here as submitted by TRI/Princeton.