Nexxus Humectress Ultimate Moisture Conditioner, with Protein Fusion, Travel Size, 3 Ounce (Pack Of 1) Nexxus Humectress Ultimate Moisture Conditioner with Protein Fusion, 3 fl oz. Born in salons and perfected by science, each Nexxus system is crafted with proteins extracted from nature’s most precious ingredients. Nexxus uses advanced scientific methods to identify the protein needs of hair, and we create highly effective custom formulas.