I got tired of sweaty butt and saggy panties from working out at the gym, so I bought a pair of these panties to replace my good old cotton ones.  The pair that I bought fit great and were perfect for the gym; very breathable.  They were so comfy and worked so well, that I immediately bought another pair.  I have a big hiking trip planned this summer and wanted to be comfortable and pack light.  Two pairs should do it!