The lightweight, breathable APEX Polyester fabric used in the Montane Women’s Dart Long-Sleeved T-Shirt is entirely recycled from plastic bottles. This reduces our reliance on virgin resources because virgin polyester is oil based, while the fabric itself has been designed to deliver the perfect balance of warmth, wicking and breathability. (You can read more about this in the Know What You Are Buying details at the top of this page.) The dual-layer pique construction dries incredibly quickly and is stain-resistant making it ideal for fast-paced activities in the mountains.