Betula vs. Birkenstock — What's the Difference?

A genus of trees of the family Betulaceae (such as birches)

Birkenstock Group B.V. & Co. KG is a German shoe manufacturer known for its production of Birkenstocks, a German brand of sandals and other shoes notable for their contoured cork footbeds (soles) made with layers of suede and jute, which conform somewhat to the shape of their wearers' feet.