Three years in the making, the women's Stinger 2 from Spira gets updated with ultra-lightweight materials for the woman looking for—and wanting—a responsive racing flat that's going to keep her going mile after mile! ; The WaveSpring technology provides a high level of responsiveness and protection against fatigue and stress while combining a level of cushioning. Features three re-engineered springs. Open mesh uppers with synthetic overlays for breathability, comfort and durability. Striped textile collar lining for comfort and the removable EVA sockliner easily accommodates orthotics. Traditional lace up front with high-contrast laces provides optimum fit. Encased TPU shank for support. EVA midsole cushions and absorbs shock. Two-piece rubber outsole for long-lasting durability. Imported. Measurements: ; Weight: 8 oz ; Product measurements were taken using size 7.5, width B - Medium. Please note that measurements may vary by size.