COMFORTABLY WARMCloud nine is the Terramar product where form perfectly meets function. The midweight fabric is ultra-soft and features climasense thermoregulation technology that automatically adjusts to your body temperature. When you are cool it traps air to maintain warmth. When aerobic activity rises and the surface temperature increases the fabric allows moisture vapor to Escape to maintain comfort.-a FEATURES86% Polyester/14% SpandexImportedFeatures climasense carbon thermoregulation technology: fast wicking and dryingMidweight warmth (2.0) makes cloud Nine extremely versatileUPF Rating 25+Functional thumbholes and all flat seam constructionUltra-soft Brushed surface Traps air and allows for increased airflow/breathability