The negatives:
to wide
too short
The "one size" of these Gravity Boots is designed Kochel who like Arnold Schwarzenegger for people. Most men and women (70%) have much smaller ankle. The designers had the boat to make quiet narrow 2-3 cm, so that the boots offer better grip. Without sweat pants or very thick wool socks or calf warmers can not use the Gravity Boots. The foam inserts are not enough for me and to slip it easily.
Be hung and completely relax is not possible in these boots. In addition to size, they are also more on the calves to cut short (still missing about 7 cm length). This means that you (or woman) while hanging in the boat in slip. Here, the short-cut metal print in the back of the calves so much that after 2 min. hang the blood no longer flows. For this purpose it is necessary to tighten the feet to be able to hold at all, which shifted the pressure to the forefoot.
Conclusion: If you want to do primarily abdominal exercises, the boots are good for it. For abdominal exercises one stretches the feet and the two of automatically, therefore, the shortcomings do not bother so much. The boots are completely unsuitable for the relaxing slopes. I bought at another model that is longer on the calves and while hanging provides better grip, because I not only want to do abdominal exercises, but also want to hang, and that as long as I want to say goodbye to the blood supply to the feet without me must.