Calvin Klein Euphoria for Women Roller Ball 10ml size Fragrances are available in different concentrations. The concentration determines the strength of the scent.Perfume (Women's) contains between 20-40% of aromatic compounds making it the strongest and purest, richest and longest lasting of the fragrance line. Eau de Parfum (Women's) contains between 10-30% of aromatic compounds, making it the second strongest of the fragrance line. Eau de Toilette (Men's and Women's) contains between 3-5% of aromatic compounds. Eau de Cologne/Cologne Spray (Men's & Women's) contains between 2-5% of aromatic compounds. Eau Fraîche contains between 1-3% of aromatic compounds.