Our hemp/organic cotton jersey (blue purple) was tested in a lab and showed UV-protection values around 100. Very impressive! Official rating the highest UPF 50+.
The mean UPF of the SGS lab testing was 101, in this test (the scan was done 4 times) UVA transmittance was only 1,2% and UVB transmittance 0,95% = about 99% of the UVA and UVB rays were blocked by the hemp/organic cotton jersey fabric in the blue purple colour.
Official rating the highest possible UPF 50+.