Kiprun KD900X First Run Review: Decathlon's Affordable Carbon Super Shoe

Introduction

Decathlon’s Kiprun line has long been a byword for solid running gear at friendly prices, and the KD900X is the brand’s attempt to apply that formula to a carbon plate super shoe. Priced at £130 in the UK (around 150 euros, with no US price confirmed at launch), it undercuts most carbon racers by a wide margin. The big hook, though, is durability: Decathlon claims this shoe will last up to 1,000 km, a bold figure when many carbon shoes top out closer to 300-400 km at their best.

This first run review covers the specs, fit, and how the shoe felt across a launch 5K and a 45-minute easy-to-steady run.

Design and Specs

The KD900X uses an 8 mm drop and, in a UK 9 / EU 43.5, weighs 249 g (8.8 oz). That is not featherweight territory, but it sits around the same weight as the Alphafly 2 in the same size, so it is still a light shoe on the foot.

The upper is a very thin, lightweight mesh with minimal cushioning at the heel and almost nothing on the tongue. Everything has been stripped back to keep weight down while holding the foot in place at speed.

In the midsole you get Decathlon’s new PEBAX-based VFOAM, currently exclusive to this shoe, paired with a full-length carbon plate. Compared with something like Nike ZoomX, the foam feels noticeably firmer to the touch. On the outsole there is a fair amount of exposed foam and a cutaway showing off the plate, but rubber coverage is solid on the key heel and forefoot impact zones, and it looks grippy enough for wet roads.

First Impressions and Fit

Sizing is worth some care. The test pair started at an EU 44 labelled UK 9, which ran big, so stepping down to EU 43.5 (still tagged UK 9) delivered a much better fit. If half sizes are available, it really is worth trying the exact EU half size to nail the fit rather than relying on UK sizing alone.

Out of the box, the shoe is firm and stiff. Expect that on the first couple of runs.

How It Feels on the Run

Across an easy launch 5K and a later 11.3 km run that finished with kilometres in the mid-3:30s, the shoe improved as the run went on. There is a genuine kick and some bounce from the foam, though the feel is firmer than most current super shoes, closer in character to recycled ZoomX foams.

Comfort held up over 11 km with no issues, and the legs did not feel rattled, but if the firmness and stiffness stay at this level, a full marathon might be a stretch for some runners, even if plenty would happily race in it.

The pace is there: it feels light on the foot and responds well as you pick things up. What it lacks so far is the wow factor of the very best super shoes. The encouraging note from people who have tested it longer is that, because the shoe is built to be long-lasting, it should soften up noticeably over the first few runs.

How It Compares to Other Budget Carbon Shoes

In the budget carbon space, the Reebok Floatride Energy X sits at the same £130 price but felt more like a solid training shoe than a true super shoe. The 361 Flame is a stronger rival: faster, slightly lighter, and softer and bouncier, though it can be hard to find and its pricing varies by territory.

The bigger problem for any budget carbon shoe is that top-tier super shoes increasingly appear at £130-150 in sales, and occasionally for less if you are willing to buy second-hand. What the KD900X can offer against those is stability; it felt more stable on the run, and if the 1,000 km durability claim holds, it has real potential as a long-lasting training and racing shoe.

Buying Advice

If you want a carbon plate shoe at a lower price and you value durability over a plush, squishy ride, the KD900X is an intriguing option. Buy it expecting a firm first impression and give the foam time to break in. Try the EU half sizes to get the fit right, and if marathon comfort is your top priority, it may be worth testing before committing to race day.

Conclusion

The Kiprun KD900X has the classic super shoe ingredients, a PEBA-based foam and a full-length carbon plate, plus a durability claim and price point that set it apart. The first runs suggest a speedy, stable, but firm shoe with real potential to improve with mileage. It is one worth revisiting as it breaks in.