Warm up and cool down in signature Rafa style. This lightweight layer provides more than enough flexibility to get through your pre-match routine. Perforations in high-heat areas like your back and underarms increase airflow to help you stay cool. Nike Dri-FIT technology moves sweat away from your skin for quicker evaporation, helping you stay dry and comfortable.The stretchy, woven fabric helps you swing and move side to side with ease.The vent in the middle of the back gives you extra room to move. Perforated fabric under the vent increases airflow.