I just bought another pair of Birkenstocks. I wore my last pair of sandals every day for about 3 years. I decided that I wanted my toes covered with more than socks this winter. I live in NC. I’m saving the sandals for the spring. My back and feet problems are nonexistent with Birkenstocks and I know I don’t need to try on my size to get an accurate fit. Leather is what you want though. Birkibuk and birkiflor will only last a year. I haven’t tried the all eva products though. I haven’t tried resoling my old leather Birkenstocks, so I can’t comment on that. The last time I priced it, it was only $20 more to buy new. That was years ago. I don’t know what it would be now.