Nike AeroSwift technology integrates innovative features and materials with precision fit to deliver exceptional mobility and lightweight comfort to help you at your fastest from start to finish. Sweat-wicking technology helps you stay dry and comfortable. Flyvent waistband provides lightweight ventilation for exceptional comfort. Lightweight brief provides extra support and ventilation. Product Details Standard fit for a relaxed, easy feel Pleated back Double Swoosh design at the sides Split hem Body: 100% recycled polyester. Waistband: 73% nylon/27% spandex. Lining: 89% recycled polyester/11% spandex. Machine wash