New Balance QIK 90 cross training shoes are optimized for dynamic training with an adaptive stretch upper that locks the foot in place with soft, secure comfort. Aggressive outsole lugs and QUIX technology allows for superior traction. Feel the confidence of sure-footing through all of your most explosive movements.Upper: Adaptive Stretch Upper locks the foot in place during dynamic movement. FantomFit creates a barely there fit using no-sew overlays that help secure the feet without binding. Flat laces reduce irritation. Midsole: REVlitefoam compound provides the same responsiveness and durability of New Balance foams 30% heavier without minimizing construction or sacrificing underfoot cushioning or stability.Outsole: QUIX improves traction and provides a solid base for the medial forefoot during lateral cutting movements.