CK One for men and women has remained one of the most popular fragrances on the market since it was released by the Calvin Klein fashion brand in 1994. It was one of the first popular unisex scents to take perfume lovers by storm. It has a clean scent that will give you energy and make you feel like you can take on the day.features aromatic green notes combined with citrus notes like lemon, pineapple, papaya, and mandarin orange to create a fresh, clean scent that’s perfect for summer.