The Ryka Assist XT cross trainer provides you with performance, comfort and fit. Combination upper of synthetic materials, air mesh, and high density foam for lightweight and breathable comfort. Dual-density midsole foam controls pronation. N-Gage EVA foam creates a super lightweight cushioning and rebound system that continues to exceed industry standards. A removable molded Nitracel footbed with an EVA strobel board. Dual piece, solid rubber outsole with balanced flex grooves for traction and flexibility. Color Grey.