Nike Mens Free Train Force Flyknit, Dark Grey/White/Black (Size 10.5) n/a Flyknit upper combines lightweight support and breathability. Tri-star flex grooves help maintain longer ground contact. Dual-density midsole cushions during heavy lifts. 5/8-height collar provides a sock-like fit that hugs the foot and supports the ankle. Heel counter creates a stabilizing structure around the back of your foot to help provide support during quick cuts.