While you wear these light shoes, you can move up, down, and across vertical surfaces and along ceilings, while leaving your hands free. You have a Climb Speed equal to your Speed. However, the slippers don’t allow you to move this way on a slippery surface, such as one covered by ice or oil.
Climb speed = walking speed on difficult surfaces and ceilings.
RollQuest ships the D&D 2024 SRD as a content pack, on a 5e character sheet that does the maths - roll from the sheet and let the numbers work themselves out. Free to start.