The skull cap is a variant of a Beanie and fits the head very tightly or snugly, therefore, having no loose tip. They are made from stretchable or breathable fabrics and are great for absorbing sweat. This quality makes them ideal to be worn under a helmet. As Skull caps are mostly worn underneath, they are undecorated.
The most common materials used in the making of Skull Caps are polyester, spandex, or nylon. Great care is given to the fact that the material should not cause any irritation to the wearer. Skull caps can also be made from warmer fabrics to avoid heat-loss and are, therefore, appropriate for winter.
Skull caps can also have a foam lining that acts as a head-protector. Skull caps come in a variety of colors.