Slim last is width 95mm.
The slim design is the last for racers who need a feeling of advanced unity between foot and boots.
The gentle curve of edge of last bottom has a superior power transmission to lateral and makes possible to switch the turn to in/out quickly. The shell design of achilles part is thick and gives a good fit on ankle part.
Medium last is width 98mm.
The design which has a little bit wider last than slim last gives a good fit with suitable fixing and comfort.
It realizes comfortable performance for medium last.