There are running shoes, there are racing shoes, and then there are shoes that look as if somebody parked a small suspension bridge under your feet. The Nike Alphafly 4 belongs proudly in that third category.

Nike says the fourth-generation super shoe delivers 10 percent more energy return than the Alphafly 3 while weighing about five percent less. In a men’s 8.5, the claimed weight is roughly 188 grams, or 6.6 ounces. That is absurdly light for a shoe carrying two Air Zoom pods, a full-length carbon-fiber Flyplate and enough sculpted ZoomX foam to make an architect reach for a ruler.

The serious change is not merely a diet. Nike revised the Flyplate geometry for a smoother transition, reshaped the Air Zoom units for better heel-to-toe movement and introduced ZoomX LT foam, which the company says returns more energy without adding bulk. A new Atomknit upper cuts weight and improves airflow, while the Fast Shot outsole is designed to hold the road when the pace turns rude.

Translation: this is not the shoe for wandering around the hardware store on Saturday. It is a specialized race-day weapon for runners trying to turn months of ugly early alarms into a personal best. The 8mm drop and towering geometry will feel familiar to Alphafly loyalists, but the lighter build and more fluid rocker should make the fourth version less like machinery strapped to your feet and more like machinery that has agreed to cooperate.

The men’s Alphafly 4 costs $280. Nike opened a limited early release on September 17, with broader availability scheduled for October 29. The official product page is live now, so buyers can track the drop directly rather than attempting some gray-market scavenger hunt.

Man & Gear verdict: wildly expensive, unapologetically specialized and genuinely interesting. If your race-day goal involves shaving minutes instead of admiring scenery, this thing has your number.