• UPF stands for Ultraviolet Protection Factor. Thanks for asking and have a great day.
    Answered on 5/1/2012 12:00:00 AM by Prod. Spec. Ryan from Sierra Trading Post
  • UPF stands for Ultraviolet Protection Factor, which is a measure of how much ultraviolet protection a piece of clothing offers. UPF 40 is generally considered a pretty high rating (meaning a higher level of protection), but your boyfriend ought to check with his doctor to find out what kind or level of protection he needs!
    Answered on 5/9/2012 12:00:00 AM by doggymcnuggets from Bedford, IN