What is the difference between Betula Birkenstock and other types of their sandals?

Birkenstocks are the original made with real leather uppers. Betula is an offshoot of Birkenstock started by Christian Birkenstock in 1994 and is a cost effective alternative to the original Birkenstock shoe. The quality of the Betula isn't as comparable to the Birkenstock, but if you want a low cost Birkie style shoe then maybe the Betula line is for you.