HERE is an album that illustrates a pretty rudimentary experiment to measure the foam compaction in my Nike Vaporfly NEXT% 2s.

I ended up with 2 pair so I decided to use one pair as a daily trainer (white pink color way), which now has 125 miles on it 10-15 miles of walking. The other pair (orange Ekiden color way) is brand new.

I put two identical Pentel Energel 0.7mm pens in the middle of the heel and took pictures showing how far the pens extended out of the shoes.

After about 125 miles 10-15 miles of walking, I’d estimate the foam has compacted by about 7-8mm.

I am unsure the rate of compaction over time, meaning I'm not sure if the foam compacts a lot at the very beginning as your foot imprints into the midsole, or if the foam simply compacts more over time. The shoes definitely feel significantly less cushy.

I’m male, 6’2” and 195lbs