At one time, I wore cotton-lycra tights with
polarfleece lining in the seat and inside of the knees. I wore them
without any undies at all. Quick and convenient for trailside pit
stops. At some point I discovered the polarfleece was very hot and was
rubbing me. Maybe the powder listed on Amazon in the previous message
would help. If one could solve that problem, NO undies at all is the way
to go. Must have soft fuzzy lining in the seat of the tights.