SPF? UPF? - Sun Protection Clothing Safety Facts
'SPF' is the sun protection rating system used for sunscreens, and 'UPF' is the sun protection rating system that is used for clothing. The maximum rating you can claim for clothing is 50+. Sun Protection Zone’s clothing far exceeds that, and provides broad spectrum protection (protection against both UVA and UVB rays).
UPF clothing is the single most effective form of sun protection against the sun’s harmful ultraviolet rays. It does not rinse off, it cannot be diluted, it does not need reapplied and it can’t be applied incorrectly, with too thin a layer or missed spots, like sunscreen lotions. Sun protective clothing is an actual physical barrier between the sun and skin and blocks not only UVB, but also UVA rays, both of which are responsible for aging the skin (wrinkles, brown spots and sagging).