Nothing. They are in the same family under the Birkenstock name. It's just a sub-group of similar style. Same goes for Papillio. All Birkenstock's.
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Birkis and Birkenstock are both footwear brands owned by the same parent company, but they have slightly different target markets and design aesthetics. Birkenstock focuses on classic, high-quality designs with a more mature customer base, while Birkis offers more colorful, whimsical styles aimed at a younger audience. Both brands are known for their comfortable cork footbeds and durable construction.