50/50 recycled polyester/acrylic. 11 knit with 2 1/2" pre-established cuff. Narrow rib knit. Product traceability via QR code label. 1 bottle was recycled for this hat. This product meets the following Sustainable Style subcategories - Sustainable Materials - Contains 50% recycled polyester Sustainable Manufacturing - This product is GRS certified. Socially Conscious Manufacturing - This product is made in a facility that is audited by BSCI/SMETA.