This is a swimming cap. I bought it for my child, but it was too big, so I'm selling it. It was only tried on, and has not been used in a pool. It was sold in the children's section, but it seems like an adult woman could also use it. - Color: Light blue (The color in the second photo is closer to the actual color.) - Size: M (Head circumference 50-59cm) - Material: 80% nylon, 20% polyurethane