The Women's Nike Free Bionic Training Shoes are for those who prefer a more bare-foot feel as they train their bodies, improve in their sport, and enhance their flexibility, whether they do so outdoors or indoors.
The incorporated Free technology means less total construction of the shoe with internal zonal training specific support only in the necessary areas, but with the Bionic Training Shoes, less is more because feet can actually gain natural strength. Nike admits that it'll take some getting use to, but nothing could be better for your feet.
The midsole is made of a lightweight, durable, and cushiony foam, but again, not too much. As these shoes support a natural feel, they offer just enough to absorb shock, but not so much as to overwhelm feet. Give the Bionic a try, and you won't be disappointed.