A while ago I bought and now use mesh boxer underwear, so much better for hiking or running than the normal underwear that I wear routinely when at home. They only cost £3.99 a pair from Decathlon, they are elasticated and cling to my skin, and when I walk or run it feels as if I'm not really wearing anything at all, but, I am 'gripped' comfortably in all of the right places! They also wash clean in an instant and dry very quickly.
I'm trying to move in the mesh direction with my base layers as well. I've just ordered a mesh Brynge 'string vest' but it hasn't arrived yet. I'm hoping that if the reviews are right I might be able to move away from my 'clammy and damp' merino and bamboo types. I wore my merino base layer when I went running this morning, it's now soaked in perspiration and to me, that's its major weakness, it then takes a long time to dry.