Calvin Klein CK One Eau de Toilette is an iconic youthful and free-spirited fragrance that enables you to be yourself. Designed for everyone to share, Calvin Klein CK One is the perfect choice for any time of the day or night. Launched in 1994 and still disruptively modern, the perfume is fresh, citrusy as well as slightly green and aromatic. A simple and effortless bottle with clear frosted glass is as clean and cool as the fragrance.