According to public health experts, the best sun hat has a wide brim (about 3 inches) that shades your face, head, ears, and neck.
The fabric the hat is made of is also essential. Choose materials that naturally block or absorb ultraviolet radiation (UVR). Darker colors are better at blocking UV rays than lighter colors. For example, a denim shirt provides SPF 1700 while a white t-shirt offers SPF 7.
Polyester, wool, nylon, and silk are better at blocking the sun than cotton, flax, straw, or hemp, as their weaves tend to be thicker. However, many fabrics with lower ultraviolet protection factors (UPF) are also breathable, which can help keep you cool in the sun. Straw hats, for example, can be utilized with a cool organic cotton lining for added protection.
Furthermore, many outdoor clothing companies treat their products with colorless dyes that block both ultraviolet-A (UVA) and ultraviolet-B (UVB) rays.
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