Various manufacturers use different materials to make their sun hats robust, comfortable, and durable. The most common material is cotton. Top manufacturers use this material as it is stiff, soft and with that ensures ultimate comfort. It allows convenient air circulation so that the user's head remains cool during hot weather. The next most used material is polyester. It is a human-made material. Although manufacturers use polyester in the sun hats for longevity, it isn't environmentally friendly. Lastly, the less used materials for sun hats are straw and bamboo. Mainly, farmers wear sun hats built with such materials. For hiking, these hats aren't good enough.