Bandanas, sweatbands and sun hats protect against heat and absorb perspiration. Sunhats have wide brims that protect the wearer's eyes and skin from sunlight and excessive heat. They are typically made of polyester, cotton or woven straw. Bandanas and sweatbands are lightweight head coverings that absorb sweat and protect against heat. Sponge sweatbands, which have a band of cellulose sponge, provide cooling comfort when worn under hard hats.