But when an individual raised by society to live, breathe and look at the world with female eyes transitions to male, some of the most enlightening, helpful and profound advice can only come in retrospect. Letter to my Brothers, features essays from respected transmen mentors who share the wisdom they wish they would have known at the beginning of their journey into manhood. 20% of the proceeds are donated to the FtM Mentors Project of TransMentors International.