a number that tells you how much protection a particular cloth gives you from the harmful effects of the sun (the abbreviation for ‘ultraviolet protection factor’)
شاخص حفاظت در برابر پرتو فرابنفش, درجه حفاظت در برابر اشعه خورشید, عامل حفاظت فرابنفش
The shirt offers UPF 30 protection from UV rays.
They use a fabric with a high UPF.
compare SPF