I usually wear mine in the fall/winter (until it gets cold)/spring. The seams in my 3/4 length pro tights (not insulated) lasted 9 months at most (maybe as few as 6?). Last year I bought a pair before marathon training - August? - and wore them through that, in the marathon, and through the spring, I believe, while Ironman training. I would say average 30 miles a week through fall, more like 20 through spring. I wore them every run with a pair of REI compression shorts over the top which covered the part of seams in question just barely (they busted just where the shorts hit, around a 4-6" inseam). So... 600-900 miles?
My first pair lasted longer, but I didn't run as much, or as fast. Ironically I lost a lot of weight between the two pairs, too, so I really expected the second pair to last a lot longer.





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