I don't get it. Someone please tell me the reasoning behind this.
Most Helpful Guy
I don't know if maybe I'm a freak or just the only guy that admits this but it's because guys sweat a lot and if I happen to do some activity that makes me sweat I don't want my sweat to show through my clothes. The first shirt absorbs the sweat and keeps the nice shirt I wear on the outside form getting deodorant stains.1