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I really tested these to the limit on a 100km walk. It would be hard to recommend them over my regular underwear, and at almost twice the cost, not terrific value spend either. After about 25km, I needed to change, they may wick sweat away down the gym, but on a warm day and a long walk, the problems of swamp ass and associated chafing were as present as with any other underwear I've worn.
Third pair of these, they do the job of an under short without the price of fancy graduated compression. I'm just trying to keep my junk from bouncing around like an inflatable tube guy while I'm doing sport.