The interchangeable soles are shaped the same so they work on either side. As to my use of the slide sock, I came up with that due to the fact that I was "between sole numbers" and this does the job. It is also good for times when it's stickier near the gutter (shooting 10 or 7 pin), just reverse the sock. Many people, as Lucky said, cut the soles and combine them for custom slide needs.