These horseshoes come in a set of four. As a Magic action, you can touch one of the horseshoes to the hoof of a horse or similar creature, whereupon the horseshoe affixes itself to the hoof. Removing a horseshoe also takes a Magic action.
While all four shoes are affixed to the hooves of a horse or similar creature, they allow the creature to move normally while floating 4 inches above a surface. This effect means the creature can cross or stand above nonsolid or unstable surfaces, such as water or lava. The creature leaves no tracks and ignores Difficult Terrain. In addition, the creature can travel for up to 12 hours a day without gaining Exhaustion levels from extended travel.
Mount can fly (4 in. off ground); doesn't need to land.
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.