How to choose a custom sunscreen mask One, thick. Thick cotton masks can block 100 times of ultraviolet rays, while thin chiffon masks are much less able to block ultraviolet rays; second, the density of the fabric. Although swimming caps and cycling caps are relatively thick, the fabric of swimming caps has greater elasticity and the gap between lines is larger, so the ability to block ultraviolet rays is poor.
However, when the swimming mask meets water, the water will form a protective film on the surface of the mask, which will enhance the reflection of ultraviolet rays and increase the sun protection factor. The third is the color of the sun mask customization. Black fabric absorbs UV rays and white fabric reflects some, and it's easy to see why such a thin chiffon still blocks 66% of UV rays.
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