ASICS AIM-TRG Back Tricot Graphic Windbreaker Hoodie SIZE L Uses heat-retaining material to provide warmth inside the garment. The outer fabric employs a taffeta material with excellent water repellency, and the inner surface features brushed tricot for a comfortable feel and warmth. "Warm the back, warm the whole body." BACKWARM is adopted, which makes the whole body feel warm by placing the moisture-absorbing and heat-generating material on the back, where the heat-sensing sensor is located.