Sleeveless compression base layer for warm weather riding. Designed to provide active compression to muscles, decreasing lactic acid build up and helping to provide greater endurance. Lightweight, breathable moisture-wicking fabric. Ventilated Lycra mesh back panel for increased airflow. Elastic shoulder attachment loops for race collar compatibility. Provides rash protection. Four-Way Stretch KWIK-DRI - Fabric wicks sweat from skin and helps regulate core temperature. Four-Way Stretch Airflow mesh fabric on back panels. Youth model.