This hat is totally indistinguishable from any of the other magical headgear, even when most carefully detected by magical means. 

Only by placing it upon the head can its powers be determined. 

Of course, once on the head, the wearer will believe that the hat is a specially beneficial item, for he or she will be overcome by stupidity. 

Intelligence will be lowered to 7, or by -1 if the wearer has a 7 or lower Intelligence normally. 

The wearer will always desire to have the hat on—especially when he or she is engaged in any activity which requires thinking, spell casting, etc. 

Without the benefit of a remove curse spell or similar magic, the wearer will never be free from the dweomer of the hat.