A swim cap is a tight-fitting head covering made from materials like silicone, latex, or lycra. It is designed to keep hair out of the face while swimming, reducing drag in the water. Swim caps are commonly used by competitive swimmers, recreational swimmers, and those participating in water sports. In addition to keeping hair in place, swim caps can help protect hair from chlorine damage in pools. They also help maintain body temperature by keeping the head warm in cooler water. Many swim caps come in various colors and designs, allowing swimmers to express their style while in the water.