The Heimat Textil mechanic hats are based on the original WWII US Navy wool hat, which soldiers would use to protect themselves from wind and weather while on deck. This merino wool hat is lovely called "the little brother" of Heimat Textil mechanics hats due to its lightweight. This mechanics hat is made of 8 gauge 100% extra fine virgin wool, given a 9cm fold so every wearer can achieve the perfect fit, whether it be above or below your ears.