Essentially, UPF (Ultraviolet Protection Factor) is to fabrics while SPF (Sun Protection Factor) is to sunscreen. Both are standard measures of how effectively the sunscreen or fabric protects your skin from UV radiation.
SPF measures how effective a sunscreen is at blocking UVB rays only - for sunscreens, there is a separate measure for UVA.
UPF measures how effective a fabric is at blocking both UVA and UVB - so in that respect, it's more holistic than the SPF.
UPF quantifies how effectively a piece of clothing shields your skin from the sun's rays, depending on factors such as the fabric’s content, weight, colour, and construction.
For example, a UPF 50 fabric blocks 98% of the sun’s rays and only allows 2% percent to penetrate it, thus reducing the risks related to sun exposure significantly.
All products selected by Palm uv clothing were tested by independent laboratories and are certified as UPF 50+ sun protection.
