The Spira Vento running shoes combine the responsiveness of high-mileage trainers with superior shock-absorption for the ultimate addition to your morning runs. Predecessor: N/A. Support Type: Neutral. Cushioning: High energizing cushioning. Surface: Road. Differential: N/A. WaveSpring Technology Unique design integrates lightweight, stainless steel springs, one in the heel and two in the forefoot. Springs provide both shock-absorbing cushioning and return of up to 96 percent of energy Mechanical cushioning is designed to reduce stress on joints. Designed to last for the lifetime of the shoes. Structured, breathable mesh upper with stretch for a great in-shoe feel. Traditional lace-up closure. Stretch bootie construction offers a comfortable sock-like feel. Laminated tongue improves flexibility and promotes breathability. Semi-curved running last for supportive, comfortable stride. Dual-density molded EVA midsole reduces impact. Dual-density Ortholite insole. High-abrasion rubber outsole provides reliable traction. Imported. Measurements: Weight: 12 oz Product measurements were taken using size 9, width D - Medium. Please note that measurements may vary by size. Weight of footwear is based on a single item, not a pair.