Based on a lot of the reviews I ordered a large since I’m sort of the fence - 5’10, 170-ish. They are slightly too big. actually a bit loose around my waist. The mediums fit quite well. Aside from sizing these are pretty nice. They’re supportive, breathable, and very lightweight. I wish they were tagless but nothing a pair of scissors can’t take care of.Bottom line. if you want a tighter fit, err on the smaller side.
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