Pith helmets, also known as kepis, topis, and topees, are a type of headgear traditionally worn in tropical climates. They are made of pith, a lightweight material derived from the spongy tissue of certain plants, and are designed to protect the wearer from the sun and heat. The helmets are typically white or off-white in color and have a wide brim that shades the face and neck. Pith helmets are still used today by military personnel, police officers, and other professionals who work in hot climates.