1.High Quality Silicone: Our adult swim caps are made with sports-grade silicone, it features odorless, non-toxic and allergy-free to guarantee safety. It is super stretchy and tear-resistant, no deformation after repeated use, which makes the swim cap easy to put on without snagging hair. Note: Please avoid sharp objects, such fingernail and hairpin. 2.One Size with High Elasticity: It is one size with good stretchy for men, women, boys, girls, adults, teens, even kids with short or medium hair. It would keeps your hair locks secure and tangle-free when you swimming in the pool! 3.Protect Hair Healthy: Our silicone swim cap keeps your hair within the swim cap to reduce your overall water resistance. While it deters water from entering, it cannot keep 100% of the water out. It not only protects hair from chlorine water damage to a great extent, we also extend the ear part of the swim hat for ear covering, it adds an layer of safeguard for your ears, let you enjoy swimming! 4.User-Friendly Deign for Good Fit: The swimming caps is designed in the shape of human skull, which not only makes a snug fit for most people, but also create a good streamline for swimming. It keeps you streamlined in the water for minimum drag and allows you better control in the water. And an anti-slip inner pattern prevents the swim cap from sliding during even the most intense sessions.