Skull caps are snug-fitting head coverings that typically cover the top, back, and sides of the head. They are often made from materials like cotton, wool, or synthetic fabrics and are designed to provide warmth or protection. Skull caps are commonly worn by athletes, especially in sports like cycling and running, to keep the head warm during cold weather. In addition to their use in sports, skull caps can also serve cultural or religious purposes. For example, the kippah is a type of skull cap worn by Jewish men as a sign of respect and reverence. Similarly, some muslim men wear skull caps called topis during prayers or religious events.