I wear jeans most of the time. I don’t know why but I don’t feel as comfortable in lighter weight pants and sweat pants are never long enough for me.
I don’t wear underwear because it can bunch up and cause construction or pressure points. Commando is the only way to go, in my opinion. Even in the hot Phoenix weather I have not had problems with rashes. However, that may be in part due to the dryness of our desert air. Very rarely do we have much humidity. Best wishes, Don.

