adidas F10 TF - Boys' Grade School 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. TRAXION TF outsole for use on artificial turf and hard ground.