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What makes fabric sun protective, or UPF rated?

April 26, 2017fabric Protective rated Sun upf

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What makes fabric sun protective, or UPF rated?

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Tightness of knit or weave: basically the tighter the weave, the higher the UPF. When a fabric is stretched, the tightness of the weave diminishes, resulting in increased UVL (ultra violet light) transmission. If a fabrics’ weave is not as tight as desired resulting in a low UPF rating, the fabric can be treated with a Tinosorb finish to raise the UPF. Thicker fabrics generally have higher UPF ratings than thinner fabrics.