Serpentine by Robert Cavalli is an EDP fragrance that uses between 15% and 20% essential oils, creating a potent scent. Most EDPs can last up to five hours on the skin, but the wear time depends on environmental conditions and skin type. Serpentine can be purchased at major department stores, but FragranceX is a solid option for buying perfumes and colognes online. FragranceX sells authentic, quality fragrances at discount prices, allowing you to save up to 80% off.