How do I "break in" a pair of racers (and my legs) ... Nike Vaporfly Next% (Read 113 times)

Even if these Vaporfly Next% are *extremely* fragile, does anyone think running 10-12 miles in them at race pace once or twice, and maybe a 10K practice run or two, will break them down so much they don't help me anymore?

I don't think they're that fragile.  There's plenty of stories of runners who've got 150 miles plus out of the original Vaporfly 4% and they were still going well, and the consensus is that the Next is, if anything, slightly more durable.

rlopez and Surly Bill are dead right to say that you don't need to break them in, you just need to get used to wearing them.