These are Replacement soles for the 3G shoes.If you need to change out your soles for something with more or less slide you can! The 3G Solid Deer Skin Sole (Slide 4) has the Third most amount of slide in the series of soles 3G carries. So if you are looking for a sole with in the middle sliding range, consider purchasing this sole. They are easy to change out, you can even change them while in the bowling alley!