As a forty-something woman I have been taking increasing measures to preserve my joints but still get a good workout. These Step Shox were recommended by folks on the forum at cathe.com, so I thought I would try them out. The large size is what will fit your standard risers - small is only for mini-risers. I have used them for several step routines and find they dampen the sound and the impact \"feel\" during the workout. My ankles and knees feel less jarred. This is a good, affordable product for anyone looking to achieve the same goals.