100% Recycled Polyester. 1 Row Stitching, 6 Panel Design, Button at Top, Moisture Wicking, Pre-Curved Peak, Stitched Eyelets, Structured Front Panel, Tearaway Label, Ultra-Soft Sweatband. Fastening: Self Fabric Strap, Tri-Glide Buckle. Sustainability: Amfori, BSCI, GRS Certified, REACH.