The Lowline II Lightweight Core Stretch Sweater is an overhead midlayer made from recycled polyester/elastane midweight fabric. It is warm, light, stretchy, and quick-drying. The sweater features a half-zip fastening for adjustable ventilation. Crafted with lightweight Ilus Core warm backed knitted stretch fabric, it is quick drying and includes a half-length zip with an inner zip and chin guard for comfort.