Calvin Klein One is a unisex citrus perfume ideal for use in casual settings. Introduced in 1994, it has become a highly rated choice that perfectly balances masculine and feminine elements. This fragrance combines woody, green and floral accords in a perfect blend to create an unforgettable range of scents. Suitable for day time use, this perfume lasts for 2 to 6 hours after application. It stands out due to its incredible palate of ingredients and exhibits a moderate sillage.