This means that Structure will hold up for more miles than Lunarglide with its softer midsole. In comparison with the Lunarlon foam in Lunarglide 9, with about 70 miles on both shoes, Structure 21 did maintain less of a dip in the forefoot, a reliable way to check how worn your shoe is. I was pleased with its performance on long runs. The midsole is not overly soft, yet it’s also thick enough that I don’t give it “ground feel.” I’ve enjoyed running in HOKA’S, but for some reason a higher ride in this Nike never lost its awkward feel. The new midsole made Structure a few mm higher (while maintaining a 10mm drop from heel down to toe height), and ironically, I kept feeling like I wanted the shoe to be closer to the ground, before I even learned about this change. In his experience the older versions with the medial cage held up much better than the Dynamic Support in the 20 (and 21), which compressed inward as the miles were added, while the outsole durability remained the same despite its overhaul in structure. The 21 is my first experience with the Structure line, so I asked a friend of mine who loved the 18th and 19th models what he thought of the 20. So all in all, the fit is closest to ASICS’ GT-2000 series.īeyond the custom-snug fit offered by the lacing system, the Structure has less…structure to it than do the ASICS GT series shoes and the brand’s new Dynamis, with the latter and GT-1000 being about the same weight as Structure 21. Structure 21 rides very similarly to the ASICS GT-1000 6, with a bit more flexibility in toebox upper fit the heel fit also gives a touch more room. This workout session cemented in my mind that Structure is more suited for mid to long distance runs than speedwork and that the more loose heel really does bother me. Turns out I still much prefer Odyssey for fast running, and the loose fit of Structure 21’s heel was even more apparent after being reminded of the snug heel fit of Odyssey. To spice up a foreboding 800’s workout this morning, I decided to run some of the scheduled repeats in Structure 21 and the rest in my favorite speed shoe, Nike Odyssey 2, to see if the Structure being half an ounce lighter made a difference.
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