The Lowline II Lightweight Core Stretch Sweater is an overhead midlayer crafted from recycled polyester/elastane midweight fabric. It offers warmth, lightness, stretch, and quick-drying properties. This midlayer features a half-zip fastening for adjustable ventilation. It is made from recycled materials, with this specific product utilizing 15 plastic bottles, and includes a chemical-free, anti-bacterial odor control treatment.