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The somersault cloud that can carry a person, if they are pure of heart. Goku used it before he mastered flight on his own.
The Flying Nimbus was given to young Goku by Master Roshi when he saved Umigame, a sea turtle friend of his.
Korin possesses a single large nimbus which can be broken down into smaller clouds such as the one Goku possesses. When the original Flying Nimbus is destroyed by the demon Tambourine, Goku is therefore able to acquire another piece.
This second Flying Nimbus is passed down through Goku's family and makes many apperances throughout the Dragon Ball Franchise.