90% Rpet / 10% Spandex. Made From Post Consumer Recycled Materials. Recycled Polyester (rPET) Is Obtained By Melting Down Existing Plastic Bottles And Other Material Sources To Create New Polyester Fiber. Label, Buckle, Sweatband And Inner Tape Are Not rPET. Water-Repellant. Laser Perforated Panels For Breathability. Low Crown & Curved Brim. One Size Fits Most. Adjustable Self-Fabric Strap With Buckle Closure.