Swimming cap bubble Crowell Java purple col.3 Crowell swim cap is a tested suggestion for people with long hair. Hair is hidden under the cap. does not fall on the eyes, face, they just don't impede swimming. The model protects the hair and scalp from the harmful effects of chlorine and other measures added to water. Thick rubber construction with bubbles filled with air on the top layer provides an effective barrier from cold. Material: 100% rubber