Facts and Review...
The Bomba is a pretty unique new shoe from Nike. Their indoor offerings are usually largely in keeping with their firm ground or soft ground selection, but the Bomba comes from nowhere.
The Tiempo line sports the Mystics, the T90's have the Shoots, and CTR goes with the Librettos, and Nike5 sports the Lunars and others, but the Nike5 line splits off now with the Bombas.
Their shape is for that of a narrow foot, but going up a half size to accommodate wider feet isn't abnormal. As for the material, the Bomba is a soft PU upper with a nice die-cut EVA sockliner.