text: Buyer  Beware. There are 2 types of these and many other Birkenstocks. One is made with a cheaper upper body, a man made material and the other is made with a more expensive but better feel upper leather called Nu Buck. You think youre getting a good deal because yourr paying $30.less.Well you're not! Youre getting an inferior Birkenstock with synthetic fabric that mimics leather. Do the research. Buy from a reputable seller that tells you this or go to an online shoe store that does not try to fool you.