The Hat Retainer is a modern remedy for that rather old problem. Constructed of recycled durable polycarbonate plastic, the Hat Retainer is inserted into the hat when the hat is not being worn, and the adjustable handle is given a gentle but firm twist retaining the size of the hat. It can also be used to increase the size of a hat, within limits, if the wearer is perhaps a growing youngster. Ongoing comfort is one of the most important facets in headwear. Good for the environment. Made from recycled plastic and packed individually in recycled boxes.