Sun protection factor (SPF) and ultraviolet protection factor (UPF) measure different metrics. SPF measures the degree to which a sunscreen protects from sunburn. UPF measures the degree to which fabric blocks ultraviolet rays.
Here is a summary of the main differences between SPF and UPF, as well as more info about each:
SPF refers to the level of protection a sunscreen offers from UVB rays that cause sunburn. SPFs typically range from 15 to 50+.
UPF is a rating used for clothing that indicates how effectively fabrics block UV radiation. UPF ratings generally range from 15 to 50+.
While SPF is specifically a measurement of UVB protection for skin protection creams and lotions, UPF rates how much UV radiation (both UVA and UVB rays) a fabric allows to pass through.
Higher SPF and UPF values indicate more protection. SPF predominantly measures UVB protection strength, while UPF measures protection against both UVA and UVB.
UPF clothing ratings take into account fabric type, weight, construction, dye, and whether the clothing is wet or stretched, which can impact protection levels.
The Skin Cancer Foundation requires a UPF 30 rating to qualify for its seal of approval but recommends UPF 50+ clothing as providing excellent UV protection.
SwimZip’s sun protective clothing and swimwear is UPF 50+. While it’s good to protect uncovered skin (especially during key sun protection times), with broad spectrum sunscreen, it’s even better to cover that skin with our sun-protective swimwear.