Calvin Klein CK One EDT is a unisex fragrance that has become a classic in the world of perfumery. With its fresh, clean, and invigorating scent, CK One is perfect for those who appreciate a modern and minimalist fragrance that can be worn by anyone, anytime, anywhere. CK One by Calvin Klein is a Citrus Aromatic fragrance for women and men. CK One was launched in 1994. CK One was created by Alberto Morillas and Harry Fremont.