Even better than Body Glide is the 2 Toms brand SportShield. It costs about the same as BG, doesn't have crumbling issues that require tossing a waxy mess in the trash, and it works better. I know several ultra-marathoners who swear by the stuff (and their sock powder, which I use for any runs further than half marathon distance)
I have a few common chafe issues when I run and the SportShield roll-on works really well. That under-boob bra band area can get a bit rubbed on long runs, but it's not an issue if I use the roll-on.
Anti-chafe products won't prevent sweat, though...and you really wouldn't want to, anyhow.



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