Parfum, also known as perfume, generally refers to the highest concentration of fragrance oils in a fragrance line. While I don't have specific details about the Polo Blue Parfum, it is likely that the parfum version offers a more potent and long-lasting interpretation of the original Polo Blue fragrance. It may feature an enhanced blend of top notes, heart notes, and base notes, providing a richer and more intense olfactory experience. The Polo Blue fragrance line is known for its fresh, aquatic, and sophisticated character, often featuring notes such as melon, cucumber, mandarin orange, basil, sage, geranium, suede, musk, and woods.