Yes, the dark grounded shirts are 30-UPF and the white grounded shirts are 25-UPF. A garment with a UPF of 30 only allows 1/30th of the UV radiation falling on the surface of the garment to pass through it. In other words, it blocks 29/30ths or about 97% of the UV radiation. Tested by the Australian Radiation Protection And Nuclear Safety Agency.