Birkenstock is meant to be wore in door. They are very comfortable especially walking on carpet. This thing doesn't cost that much in its home country. When sampai malaysia jadi mercedez and every retard is wearing them outdoor not because they have the best cushion, but to show off that they can afford birkenstock.

Judging by all above ignorant negative comments, how many of you really owns a genuine pair remains to the question. Sour grapes. If u don't understand and can't afford the high price for such sandals, suggest u to dig some research before making a fool out of yourself.
Regarding the "this shoes meant for indoor" comment, I find it hilarious. No European slippers or sandals are specially made for indoor or outdoor purpose. Just wear it whenever and whenever u like. Birkenstock comfort emphasize on arch. It is design to fit perfectly on your feet. Not for cushioning purpose.