This question already has an answer here:
I'm training currently for a long distance walk (the welsh 15 peaks in 24 hours) and I'm doing some long days (12 hours plus). I'm having some real trouble though with quite painful chafing in my (ahem) crotch area.
It appears to be being caused by my underwear and trousers rubbing while I'm sweating and moving.
I feel like I could do with some kind of Base Layer but not 100% sure what to do about this.
Anyone have any ideas how I can minimise this?
PS I'm not wearing a harness for this so it's not that that's causing problems