Showtime Mens Solid Sleeveless Crew Neck Basketball Jersey 86% polyester 14% spandex Imported Sleeveless design. Compression fit Stretch-mesh Underarm Panels: For ideal ventilation Gradient Compression: Enhance circulation and increases blood flow to boost your power, speed, and stamina Compression reduces movement and focuses direction for less vibration in your muscles, less soft tissue damage and less soreness after you exercise Ideal for low to high intensity training