Other reviews complain that these use thinner foam than comparable products. The wrenches that come with the package to tighten the bolts are not of good tolerances so not a good fit to the bolts, but they work So? I would recommend. Plug this device in and had a blast learning how to use it. They just work. Well made device. go watch a video. I do want to also say that no where in the box were any instructions on how to use the machine. Bit expensive, but worth it. Hope this steers you in the direction of purchasing these fabulous shoes. The straps stretch but probably not enough to go around an Otter Box or anything.