S-works shoes are the best cycling shoes I have used but more importantly they fit my somewhat special foot. They use the Boa closing system that comes with a lifetime guarantee. My Boas wore out so the company sent me two sets. I put one of the sets on my right shoe. A couple of days ago, I replaced the ones on the left shoe. However the left shoe Boa closing mechanism did not work. I followed the instructions carefully.
I talked with the company and the tech informed me that right closers have a red dot and the red dot on the guts must match the red do with the dials. Blue goes on the left. I have them all effed up. One hour later, I have four functional closing devices on the S-works shoes.