UPF, or Ultraviolet Protection Factor, is vital when it comes to swim shirts and rashguards. This factor determines the top’s ability to block out UV rays, with a UPF rating of 50 and up blocking out 98% of the harmful rays. Brands like Columbia and Kanu Surf incorporate UPF into their fabrics to create long sleeve shirts for boys that are perfect for beach days or any sunny outdoor excursion. In addition to offering sun protection, these tops all use breathable and quick-drying material to ensure comfort.
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