ULTRAVIOLET PROTECTION FACTOR (UPF)
IT'S ABOUT THE FABRICS™
UPF is the rating system used for apparel. It is similar to SPF (Sun Protection Factor), the rating system used for sunscreen products. SPF pertains only to a sunscreen's effectiveness against UVB rays, considered to be the more damaging type of light. UPF, however, gauges a fabric's effectiveness against both ultraviolet A (UVA) and ultraviolet B (UVB) light.