Keratin and water.
D006801:Humans; D007633:Keratins; D008055:Lipids; D009995:Osmosis; D010539:Permeability; D012867:Skin / Q000378:metabolism*; D012869:Skin Absorption; D014867:Water / Q000378:metabolism*
D008055:Lipids; D014867:Water; D007633:Keratins