Carl Nassib -- the NFL's only openly gay player -- will be showing his support for the LGBTQ+ community on Sunday ... by wearing a pair of custom rainbow cleats.
The Raiders pass rusher -- who came out as gay earlier this year -- revealed the unique footwear this week ... announcing he'd be sporting the shoes for Las Vegas' matchup with the Washington Football Team.
If you're unfamiliar, the NFL is allowing teams to rock custom cleats in Week 13 to raise awareness and money for causes close to the players' hearts .