SPF is for Sunscreen; UPF is for Clothing & Swimwear
SPF stands for Sun Protection Factor.
Some manufacturers and even some websites describe their clothing as
SPF protective. However, as we all know, SPF describes a sunscreen's protectiveness.
UPF stands for Ultraviolet Protection Factor.
To help the consumer better determine the protection a garment has, a
UPF rating system has been developed. Shoppers should only consider
buying a UV garment that as a UPF rating (Ultraviolet Protection
Factor) and moreover, from a reputable company and/or manufacturer that
promotes the UPF rating system. This ensures that they are getting
only the very best protection from their UV sun protective apparel item.