Nike Alphafly 3 –Prototype White FD8356-100

Before the Record. Before the Release.

The Nike Alphafly 3 "Prototype" in White / Black / Total Orange is a rare, collector-grade colorway that references Nike’s internal sample and testing culture — a shoe that looks like it came straight off the development bench before a world record attempt. The handwritten prototype number on the midsole is not a design detail. It’s a document.

• White / Phantom Atomknit 3.0 upper — Nike’s most advanced racing knit in a clean, slightly ghosted off-white that carries a subtle shimmer and translucency at race weight — the kind of upper that disappears on your foot and lets the midsole carry the visual story
• Black reflective gradient Swoosh — a dark, metallic-finish Swoosh that transitions from deep black at the base into a reflective grey shimmer — a premium racing detail that catches artificial light mid-stride and signals the shoe’s elite intent
• Black heel collar — a dark interior trim that frames the ankle entry with a sharp contrast against the white upper, referencing the monochrome precision of Nike’s prototype testing aesthetic
• Handwritten "20820-4" sample code on the midsole — a prototype development number written directly onto the cream ZoomX foam in black ink — the defining detail that transforms this from a colorway into a collector’s artifact. A reference to the internal sample designation from Nike’s performance lab
• Cream / Sail ZoomX foam midsole — an oversized, voluminous midsole in warm off-white with Nike’s most energy-returning foam compound — the same geometry that has powered marathon world records, in the raw, unfinished tone of a shoe that hasn’t been through final colorway approval
• Total Orange to Red gradient forefoot Air Zoom pod — a vivid red-to-orange Air unit glowing at the front of the midsole — the one burst of saturated color on an otherwise stripped-back prototype build, marking the point of maximum impact with maximum energy
• Full-length carbon fiber plate in the ZoomX stack for elite propulsive efficiency at any pace, on any race day

Most shoes are made to be worn. This one is made to be studied. The Nike Alphafly 3 Prototype is for collectors and competitors who understand that the most interesting version of a shoe is always the one before it was finished.

Nike Shoe Size Guide