BLK/BLK Features: * Designed to support the body's core to enhance posture during training and competition, while providing excellent arm movement. * Powerful and lightweight, using PWX FLEX material and highly breathable mesh panels. * Sleeveless design allows it to be worn discreetly under uniforms during training and competition. * Strong PWX FLEX material supports the biceps, triceps, forearms, deltoids, pectoral muscles, and core abdominal muscles. * Deep V-neck for good ventilation and comfort. * Power mesh panels provide good breathability in key areas. * Flatlock seams reduce friction for added comfort. * Uses powerful Invista LYCRA for a great fit, support, and recovery. * Uses high filament yarn - wicks sweat away from the skin to the outside of the material, increasing dryness. * Antibacterial, UPF50+ UV protection Specifications: Material: 80% Nylon, 20% Synthetic Fiber Worn a few times for running and marathons, and has been washed. Thank you.