Elastic in legs don’t stay tight

I went up a size since people were saying they run small. I wear an xl in Hanes colored briefs so I figured xl in these white briefs would be the same. The waist fits fine but after an hour or so of wearing them the elastic in the legs become loose. No support at all. My Hanes premium colored briefs don’t do this. I reordered one size down (Lg), will see if they’re any better. Really disappointed in these briefs.

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