Let me first say that I have 6 pairs of these!! I read a lot of reviews on Amazon which ultimately helps me in my purchase and so I figure I return the favor to everyone out there contemplating.  First of all, I've ran 18 miles on these and no chaffing.  Second, I've spent many summers in the deep south in heavy uniform (in the military) with these and felt super comfortable.  Third, these go perfect with our lame uniform shorts that are way too short and it's quite embarrassing not to wear these and doing sit ups while your partner has to stair down at your baggy shorts!  Lastly, they are battle tested, with stood several months of deployment down range!  Yes, I do own several compression shorts but they are few dollar more than these which I don't like and I also don't like the fact that they are way too tight.  Under Armour definitely got this one right!!