adidas Adizero Boston 4 Women's Black Synthetic/Mesh Upper:Air mesh upper delivers maximum breathability. Lightly padded tongue and heel collar enhance instep comfort. Flat laces reduce irritation and pressure points. Synthetic overlays provide support and a secure feel. Midsole:Non-slip lining provides comfort and performance. FORMOTION adapts to the ground to ensure the smoothest, most comfortable run. adiPRENE+ in the forefoot maintains propulsion and efficiency. TORSION System maintains midfoot integrity. adiPRENE highly shock absorbent material cushions and protects your heel at impact. Removable insole.miCoach compatible. Outsole:adiWEAR offers optimal durability in high-wear areas. Continental rubber is ideal for optimal grip on the road and in wet conditions. Blown rubber outsole gives lightweight grip and cushion.