After many many many kilometers of
tour riding and guiding we have had time to sort out what type of gear and brand is good in regards to the equipment. But as this is not a product review I will go down to one element no one ever talks or even considers testing in magazines : the underwear !
As a man I can only write about our male butt situation and will let the ladies comment about their own issues.

This topic is just set aside by everyone. Ron Ayres in his
Going the extra mile, Insider tips for long distance motorcycling and endurance riding on page 23 writes a couple of lines about the materials and the sewing but nothing about the shape.
Sewing is an important discomfort factor and can after a few hours ride get you to dream about a huge ice cube to sit on.
But there is one thing you never think about when you go for a ride: the shape! You may have your own favorite one: briefs, G string, underpants etc… and go for the one you are used too.
But if, like me, you like the briefs “holds the whole pack together”, you will end up in a very uncomfortable situation while the borders slowly get their mark on your
soft baby butt skin.
On the other side underpants will not have the border right where you sit but may need some adjustment to feel comfy and avoid misplaced folds. You may also have to fight against a certain level of freedom and moving parts.
After many different testing I ended up with a mixed solution of underpants crossed with briefs: boxer briefs. Sewing is no more under your buttocks and the material holds what should be well maintained.
Just an advice but comfort is paramount isn’t it?