After teaming up with Proof of Concept, an Oregon-based shoe development company, Lee released the first official batch of shoes in 2014. They came in two sizes: for kindergartners to 4th graders and for 5th to 9th graders. Each of the two versions can be adjusted at three places: straps on the toe, heel and either side. The shoes are made out of compressed rubber and high-quality leather.
Lee's