RemindsDon\'t believe it if some advertisment boasts their mesh can block more than 90% UV rays.It\'s totally a cheat!Intertek lab test shows fabric with mesh holes can block 86% UV rays AT MOST.Your normally seen T-shirt fabric can block 99% UV rays,that is UPF 50+.Keep in mind that the thicker and finer the fabric is, the more UV rays it can bloc..