So I bought these hoping they would be just like the leather versions... they are not.
They make my feet sweat on the bottoms which causes a weird sound when I take a step.
I work in a cold storage warehouse while wearing these doing clerical work...my office is between 45 and 60 degrees at all times and I usually have to bundle up...but these make my feet sweat and hot.
I think you should spend your $40 on a better pair of shoes... im pretty disappointed in Birkingstocks they never let me down in the past.