The application of petroleum jelly by swimmers, particularly in open water or during long-distance events, is a common practice. This emollient substance creates a hydrophobic barrier on the skin. This barrier helps to mitigate the effects of prolonged exposure to water and reduce friction.
Its importance lies in preventing chafing, a painful skin irritation caused by repetitive rubbing against wetsuits, skin-on-skin contact, or equipment. By minimizing friction, the substance enhances comfort and performance, allowing swimmers to focus on their technique and endurance. Historically, it served as a primary defense against the elements before specialized swimwear materials became widely available.