HI-INTENSITY TRAINING
Lighter in weight, stronger in rigidity and faster in deformation and rebound. The bionic design of the human metatarsal bone reduces weight and provides precise rebound
- 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 : 7.97 oz (226 g)
Heel Stack
35 mm
Forefoot Stack
29 mm
Heel-Toe Offset
6 mm
HI-FIBER Whole Flyknit Upper
HI-FIBER HI-Strength yarn & Flywire tech for superior toughness; streamlined fit, lightweight & breathable design with 360° ventilation to keep feet cool and dry.
HiFoam Max+HiFoam∞ Supercritical Foamed TPU Midsole for Panels
Upper Midsole: New high-performance supercritical foam lamination for responsive footfeel. Lighter weight, exceptional cushioning & rebound, and maximized energy return for ultra-bounce.Lower Midsole: Proprietary "Running-Driven" foam tech. Reduced weight, superior shock absorption, and boosted energy return for powerful rebound.
Bionic Heterogeneous Carbon Claw
Lighter weight, greater rigidity, faster rebound. Metatarsal-bionic design cuts weight and delivers precise bounce-back.Triangular rib reinforcement further boosts rigidity and torsion resistance for stable support and propulsion. Contoured upturned lateral arch structure enhances stability for smooth cornering.
AGCS Wet Ground Anti Slip and Wear-Resistant Outsole
The outsole of the All Ground Control System is made of polyurethane, delivering superior slip resistance on wet surfaces and exceptional wear resistance. It ensures powerful grip, conquering any slippery challenge with ease.
Trusted by Elite Athletes. Proven in Competition
From training camps to the 2025 Asian Athletics Championships, HI-INTENSITY TRAINING has earned the trust of athletes from the Vietnam National Team. Continuously tested through training, preparation, and competition environments, it delivers proven performance and efficient energy return—helping athletes stay focused on breaking through with every stride.
No Fear of Rain. No Compromise on Performance
From training sessions to race day, the AGCS Wet Ground Anti-Slip & Wear-Resistant Outsole delivers exceptional traction and durability, helping athletes confidently tackle wet and slippery surfaces in any condition.
Built for Competition. Born for Speed
Whether competing on the international stage or running toward personal goals, HIRACER combines lightweight comfort, reliable stability, and responsive performance to help athletes achieve new personal bests with every step.