adidas F10 FG - Boys' Preschool When you think speed, you think rockets, jet planes, space shuttles, and the adidas F10. And if you didn't before, you do now. Soft BRAVO synthetic upper with leather finish in forefoot area for precise touch and light weight. Die-cut EVA insole for lightweight comfort. adiFit measuring tool for accurate fit. Ultralight multi-colored outsole with SpeedStud configuration brings a new 2nd level of traction to the forefoot base for increased grip and explosive agility.