SPF 1138, a sunscreen product manufactured by Twin Suns, was exclusively utilized by Sith Lords, notably including Darth Sidious. During a vacation on Scarif with his apprentice, Darth Vader, Sidious instructed Vader to apply SPF 1138 to his back because his shoulders had suffered sunburn from the sun. Furthermore, Sidious also employed SPF 1138 during a separate instance on Naboo.
The sunscreen SPF 1138 made its debut appearance in LEGO Star Wars Summer Vacation, an identification confirmed through a post on the official Star Wars Twitter account.