Adidas Women's Adizero Boston 6 W Running Shoe Synthetic/Textile Imported Rubber sole Shaft measures approximately low-top from arch Weight: 7.5 ounces (size 7); runner type: natural; midsole drop: 10 mm (heel: 29 mm / forefoot: 19 mm) Boost is our most responsive cushioning ever: the more energy you give, the more you get Textile upper with engineered mesh forefoot provides comfort and breathability; torsion system for midfoot integrity Continental rubber outsole for extraordinary grip in wet and dry conditions