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KM3 PRO
Three reinforcing ribs at the arch increase the carbon plate’s torsional rigidity and durability, providing greater support and more powerful propulsion. The plate’s rapid energy return helps drive each stride forward. The carbon plate curves upward along the lateral side of the arch, improving stability for smoother cornering.
- Find your size in the chart below.
- Scroll horizontally to see more sizes.
| US - Men's | 2.5 | 3.5 | 4.5 | 5.5 | 6 | 6.5 | 7.5 | 8 | 9 | 10 | 11 | 12 | 13 | 14 |
| US - Women's | 4.5 | 5.5 | 6.5 | 7.5 | 8 | 8.5 | 9.5 | 10 | 11 | 12 | 13 | 14 | 15 | 16 |
| EU | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 |
| CM | 22 | 22.5 | 23 | 24 | 24.5 | 25 | 25.5 | 26 | 27 | 27.5 | 28 | 29 | 29.5 | 30 |
| UK | 2 | 2.5 | 3.5 | 4.5 | 5.5 | 6 | 7 | 7.5 | 8.5 | 9 | 10 | 11 | 12 | 13 |
Size Measuring Guide
A perfect fit for your ultra-marathon running shoes is important for comfort and performance. Follow these tips to measure your foot size at home:
General Tips:
- Measure your feet at the end of the day as they're at their largest due to swelling.
- In between sizes? One foot is bigger than the other? Take the larger size.
- It's best to measure every year. Your size could change over time.
What You'll Need:
- A piece of paper larger than your foot,
- A pen or pencil,
- A ruler or measuring tape,
- Socks of the thickness you'll wear with the shoes.
Steps:
- Stand on the paper in the socks you'll wear with the shoes.
- Use the pen or pencil to mark the end of your longest toe and the back of your heel. It's important to measure both feet as their size can vary.
- Match your measurements to our size chart to find the best fit. If you're between sizes, we suggest choosing the larger size for better comfort.
Weight
US(M)7.5 : 7.23 oz (205 g)
Heel Stack
29.7 mm
Forefoot Stack
25 mm
Heel-Toe Offset
4.7 mm
HI-FIBER High-Strength Fiber Upper
Built with HIRACER HI-FIBER technology, the upper uses fibers finer than human hair. A specialized weaving process creates breathable micro-openings that enhance ventilation, toughness, and durability. An integrated reinforcement structure ensures a seamless, snug fit. Paired with an integrated flywire tongue, it delivers a technologically advanced, highly breathable upper.
HiFoam Max + HiFoam∞ Upper Midsole Layer Made from Foamed Sheet Material
Upper Midsole Layer: Made using an all-new high-performance sheet-molding process, it reduces midsole weight while delivering exceptional cushioning and resilience. It also improves energy-return efficiency for an ultra-responsive ride.Lower Midsole Layer: Made using the “Dynamic Motion” foaming process, it reduces midsole weight and improves shock absorption. The process also enhances energy return and delivers powerful rebound.
HiCarbon Full-Length Asymmetrically Shaped Reinforced Carbon Plate
Carbon fiber layers are arranged in multiple directions to meet dynamic movement demands. Three reinforcing ribs at the arch increase the carbon plate’s torsional rigidity and durability, providing greater stability and more powerful propulsion. The plate’s rapid energy return helps drive each stride forward. Its asymmetrical shape extends upward along the lateral arch to improve stability during cornering.
KPU Wear-Resistant and Slip-Resistant Outsole
Slip-resistant KPU studs across the full outsole provide excellent traction on wet surfaces, exceptional wear resistance, and secure grip in slippery conditions.
These shoes look amazing and have a really secure, locked-in fit. The bounce is awesome too.
My 16-year-old son also loves these shoes. He says they're very comfortable and the size is perfect. The shoes themselves are generally good, but the shoebox was slightly deformed when the package arrived.