This popular bottle-opening Guinness cap is both cute and practical. It is made from 100% breathable Cotton, a great moisture resistant and durable material. The bottle green cap is sturdy and high quality, featuring authentic Guinness embroidery that includes the brand's trademark Irish harp and the word “Ireland” featured right under it. The harp is a symbol of Irish pride and appears on many official papers and documents. Considered a heraldic symbol of Ireland, the harp represents the sovereignty of Ireland in early Irish mythology. Best of all is the bottle opener ingeniously built into the brim, making this one of the most useful details in a hat. Surely a unique and functional hat you and your friends will find very efficient.