Under Armour Threadborne 1/2 Zip Mock - Blue/grey Pure, unadulterated comfort. It’s lighter, more breathable, stretches, and recovers better than anything you’ve ever felt. Fitted: Next-to-skin without the squeeze Threadborne Siro uses a unique construction process to create a fabric that has greater stretch & recovery, incredibly soft feel & more breathable performance Lightweight fabrication offers superior airflow for a cooler feel Amazingly soft French Terry fabric circulates body heat to help regulate your core temperature Split thumbhole traps heat & secure sleeves Zipper placket for easy layering Nylon/PolyesterImported