Nike MLB Hypercool Performance Top - Men's The baselayer that pro players depend on, Nike HyperCool tops are designed to keep you cool on even the hottest days. Engineered Dri-FITŪ stretch fabrics are paired with mesh on the back panel and under the arms. This combination pulls moisture off the skin and evaporates it with ventilation in these key areas. The back mesh works double time, with bonded open-hole mesh pods for maximum airflow. All seams are designed to enhance comfortable movement, so nothing is restricting or distracting. The body-skimming fit allows air to reach the skin. Includes MLB batterman logo at the back neck and an MLB team logo at the center chest. 84% polyester/16% spandex. Imported.