adidas Running - Response Trail XI (Titanium/Toro/Light Silver Metallic) - Women's: Generation of testing have refined the original authentic trail shoe to the point of near-perfection. Stretch tongue enhances the fir and the TRAXION(tm) outsole grips any surface. Upper features 360 degree reflectivity for safety in low light condition. High abrasion textile with low water absorption and sock-like fit. Molded EVA insole for anatomical comfort. Midsole features 3-D TORSION(R) SYSTEM for best midfoot integrity. adiPRENE(R) provides protection from harmful impact forces. adiPRENE(R) provides protection from harmful impact forces. Decoupled heel defects impact shock. Flex grooves in outsole for optimum forefoot flexibility. TRAXION outsole for maximum grip in all directions.