Nike Ultrafly 2 Acg

Nike Ultrafly 2 Acg review: what runners say

Fit

Slim fit, generally true to size but with a slightly narrower toe box compared to the previous version. Runners with wide feet may need to size up half a size.

Feel

Soft, bouncy ZoomX in the heel; more controlled forefoot thanks to the textile wrap. On smooth terrain the combination delivers real efficiency; on technical singletrack the stiff Flyplate destabilizes the stride.

Durability

Vibram Megagrip Litebase outsole with 3 mm lugs. One Reddit user reports approximately 1,500 cumulative miles across multiple pairs. Adequate for hardpack and gravel; insufficient in deep mud or snow.

Best for

Race day or long-run shoe for non-technical trails, gravel, and mixed road-dirt routes. Ideal for ultras on fast courses like Black Canyon or Western States; not suited for technical alpine terrain or muddy conditions.

Weak points

The stiff Flyplate destabilizes on uneven transitions and technical off-trail terrain, generating tension in the arch and forefoot. The 3 mm lug depth is insufficient on sand, mud, and snow. High price relative to actual versatility.

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