Thicker and "Wrinkle free" because they are produced with near seamless construction. This makes it more round, allowing for fewer wrinkles when worn. It’s the near wrinkle free construction allows swimmers to be more streamlined in the water. Designed to provide protection from damaging chlorine and increased speed. Developed with a wrinkle-free fit for reduced drag, our Swim Caps are made to slide on easily and stay on. Perfect for adults and children, our Wrinkle Free Swim Cap is a great hybrid for training and racing.