A Refined Follow-Up to Nike's Original Ultrafly
Nike has the Men's Nike ACG Ultrafly Trail Racing Shoes marked down to $140.97 from $260.00 — a roughly 46% discount on the updated version of Nike's Ultrafly trail racer, refined specifically for control on technical terrain rather than just raw cushioning.
ZoomX Foam and What "Highest Energy Return" Actually Means
The midsole is built from ZoomX, Nike's foam compound with the highest energy return in its running lineup — meaning more of the energy from each footstrike gets returned to the next stride rather than absorbed and lost. In the heel specifically, the foam is left "unwrapped" (not fully encased by the outsole) for even more responsiveness where trail runners spend a lot of impact force.
A Carbon Plate Tuned for Trails, Not the Road
A full-length carbon fiber plate runs through the midsole, but it's deliberately less stiff than the plate in the original Ultrafly — road-racing carbon plates are usually tuned for maximum forward propulsion on flat, predictable surfaces, while a trail shoe needs some give to handle roots, rocks, and uneven footing without the plate fighting the runner's foot on every step.
Grip and Water Drainage for Genuinely Wet Terrain
The outsole uses Vibram Megagrip, a rubber compound specifically developed for reliable traction on wet rock and technical trail surfaces — a meaningful upgrade over a standard road-shoe outsole, which loses grip fast the moment a trail turns muddy or rocky. The mesh upper is built to drain water rather than trap it, so a creek crossing or a rain-soaked trail doesn't leave the shoe waterlogged for the rest of the run.
Weight and Drop Specifics
At approximately 287 grams (about 10.1 ounces) in a men's US 10, with an 8.5mm heel-to-toe drop, this sits in a fairly standard range for a max-cushion trail racer — not an ultralight minimalist shoe, and not an unusually heavy max-stability trail shoe either.
Who This Shoe Is For
Trail runners who want genuine race-day cushioning and carbon-plate propulsion without giving up control on technical, uneven ground — this isn't a casual hiking shoe or a road shoe pressed into trail duty, it's built specifically for trail racing and fast technical trail running.
The Bottom Line
At $140.97, down from $260.00, this is genuine trail-racing performance gear — ZoomX cushioning, a trail-tuned carbon plate, and Vibram grip — at a meaningful discount on real trail-specific technology, not a lifestyle shoe with trail styling.
Browse more current NIKE markdowns on NIKE's deals page, or check active NIKE promo codes before you check out.
