If you have ever seen competitive swimming, you will see swimmers with there head covered. That item covering their head is a swim cap.
Adidas and Soul Cap release swimming cap designed for Black hair
How to Keep Your Hair Dry and Damage-Free While Swimming (and the Best Swim Caps for Dry Hair)
Aquatic Programming - Recreation - University at Buffalo
BLOG 1 - WHY SHOULD STUDENTS WEAR SWIM CAPS?
How Swimming Helps Your Body
Why You Should Wear a Swim Cap
Embracing Swimming in an Indoor Pool!
Controversial Swim Cap Rules Are Being Reviewed Before Olympics
Embracing Swimming in an Indoor Pool!
Swimming Drills: Improve Speed, Strength, and Efficiency – FORM