My first pair already 5 years, not a lot of cracks but still wearable.

Now total got theee pair, I am die hard red color fans.

Then I just wear it like normal slippers, don't care if it's wet or not, just walk only.

I saw a lot go shoeless and hug their birkens during rain, the what is the point u buy? Shoes should wear like a shoes.

Serious, I saw it with my own eyes and I have the same thought as you.

Around 30% except the top and bottom tend to worn out faster.