When Kiprun launched the original KD900X, it disrupted the running world by offering race-ready specs at a fraction of the cost of premium competitors. Now, the French brand doubles down with the KD900X.2—a shoe that sharpens its predecessor’s edges while staying true to its mission of “accessible performance.” With a revamped midsole, sleeker design, and tech-forward upgrades, this iteration isn’t just an update—it’s a statement. Let’s dive into why this budget-friendly speedster deserves your attention.
Key specifications:
Brand: Kiprun
Model: KD900X.2
Weight: 197g (men’s US9)
Heel: 31 mm
Toe: 25 mm
Heel drop: 6 mm
Carbon plate: Yes
Price of Kiprun KD900X.2
Price: $148 USD
Release date: April, 2025
What’s new in Kiprun KD900X.2?
Kiprun’s mantra for the KD900X.2 is clear: maximize your potential. While the first-gen model prioritized raw speed, this version refines the formula with a focus on connectivity and durability. The brand hints at a “significant communication network” in its press materials, likely referencing enhanced integration with running apps or community-driven features—though details remain under wraps. What’s tangible, however, are the upgrades: a lighter yet more structured upper, a reconfigured carbon plate, and a midsole foam tuned for longevity.
Upper: Streamlined comfort, with caveats
Kiprun has finally cracked the code on uppers. The KD900X.2 swaps the original’s stiff mesh for a breathable engineered knit that hugs the foot without pressure points. Laser-cut perforations boost airflow, making this a strong pick for warm-weather training. The heel collar and padding strike a balance between plushness and lockdown, though the tongue remains minimalist—ungusseted and thinly padded.
Fit-wise, the shoe runs long and narrow, a hallmark of Kiprun’s design philosophy. Runners with wide feet may feel pinched, but those with narrow or average-width feet will appreciate the snug, race-ready feel. The laces are basic but effective, and the absence of excess fabric keeps weight in check. For a brand once criticized for clunky uppers, this is a leap forward.
Midsole: Where science meets speed
The star of the show is Kiprun’s Voo foam, an aliphatic TPU compound boasting 85-90% energy return—a figure rivaling elite foams like Puma’s Nitro Elite. Paired with a full-length carbon plate positioned closer to the foot, the result is a ride that’s explosively responsive yet surprisingly versatile.
Kiprun is claiming “27 hours of work” (likely a durability claim), and the foam’s resilience backs this up. Unlike many budget foams that deaden over time, VFOAM retains its pop even after hundreds of kilometers. The 6mm drop and pronounced rocker geometry encourage a quick turnover, ideal for tempo runs or 5K-10K races. While marathoners might crave more cushioning, the KD900X.2 shines as a speedwork specialist.
Outsole: Grip that goes the distance
Kiprun’s translucent rubber outsole looks unassuming but delivers tenacious grip on wet roads and tracks. Strategic flex grooves enhance flexibility without sacrificing durability—a nod to the brand’s promise of “supportment and protection”. In my early testing of about 25 miles, I have hardly seen any wear and tear, suggesting this outsole is built to endure.
Who should buy this shoe (and who should pass)
Buy it if:
- You’re a neutral runner seeking a lightweight trainer for intervals, races, or fast long runs
- You want elite-level energy return without the $250+ price tag
- You prefer a snug, performance-oriented fit
Skip it if:
- You need maximum cushioning for marathon distances or recovery runs
- You have wide feet or require stability features for overpronation
- You dislike firm, aggressive rides
Verdict
The Kiprun KD900X.2 isn’t just an upgrade—it’s a revelation. By refining the upper, amplifying the midsole, and doubling down on durability, Kiprun has crafted a shoe that punches far above its $148 price point. While it won’t replace premium super shoes for marathon day, it’s a thrilling option for runners craving a lively, responsive trainer for shorter bursts.
For those seeking alternatives, Kiprun’s lineup delivers: the Kiprun Cushion 500 perfect for your daily runs or recovery runs, while the Kiprun KS 900.2 stabilizes every stride for overpronators. But if speed is your priority, the KD900X.2 reigns supreme.