A swimming cap is a close-fitting, stretchy head covering typically worn by swimmers to:
Reduce drag in the water, helping improve speed and efficiency.
Keep hair out of the face and goggles while swimming.
Protect hair from chlorine or saltwater (though not entirely waterproof).
Maintain hygiene in pools, as required by many swimming facilities.
Swimming caps are usually made from materials like:
Silicone – smooth, durable, and hypoallergenic.
Latex – thinner, stretchier, but can tear more easily.
Lycra/spandex – soft and comfortable, but not water-resistant.