MTB shoe test: Fox Union Boa Flat - expensive, but also good?

With the Union Boa Flat, Fox has one of the most expensive flat pedal shoes in its range. However, the model is currently reduced from an impressive 229 euros to 172.49 euros. This makes the shoes a little more affordable. Anyone who buys the shoes with the Fuchs logo will get a robust and seamlessly processed upper material and an insole with an adjustable pad. The ventilation holes above the toes are more of a hint than an effective fan. The main reason why you might invest in the Fox Union is probably the two high-quality Boa closures. This is the Li2 version, which allows fine adjustment in both directions. This should make it easy to adjust the shoe while riding. Good: There are also half sizes between 41.5 and 45.5.

Fit & handling

There is probably no better way to loosen the laces than with a double Boa fastener - especially when it comes to the Li2 fasteners, which can be opened or closed in micro-steps even while riding. The hold in the shoe is therefore pretty optimal. If you want a little more support on the arch of the foot, you can stick the higher pad under the sole. We find the effect pleasant.

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The Fox Union is slightly narrower than many other models, especially in the toe area. Bikers with wide feet should pay attention to this. It's better to do one more lap in the shop than risk pressure points on the toes at the end of a long tour. The heel is well cut and keeps the foot cleanly in the shoe. Although the ankle area is relatively low-cut, the transition between the ankle area and the tongue is hard and has caused unpleasant pressure points both on the pedals and when running.

Grip & stability on the pedal

In terms of grip, the Fox ranks in the solid midfield and provides good grip even on technical descents, even if shoes like the First Degree or the Suplest create even more grip on the pedal. The profile seems to interlock well with the pins, because in terms of sole hardness, the Union Boa Flat is more on the hard side. We never had the feeling of losing contact with the pedals from time to time. The shoe can also be repositioned relatively easily in terms of foot position.

I think the Fox Union is perfect for hard, rough terrain or for bikers who value good power transfer when pedalling. Because whether you're pedalling uphill or pushing on the trail - nothing twists here. This gives the Union a direct and sporty feel, but it also quickly becomes tiring and uncomfortable. - Stefan Frey, BIKE test editor

Running with the Fox Union Boa Flat

Away from the pedals, the Fox Union was less convincing. The upper material is stubborn and not very flexible - which also makes it look a bit cheap. When rolling, the Fox bends uncomfortably and presses on the metatarsals. The consistently flat tread provides little traction, especially on damp ground, roots or rocks.

Fox Union Boa Flat - Info & Price

• Weight(size 46): 914 g
• Sizes: 37-47 / 41,5-45,5 half sizes
• Equipmentsole with pad (low/high); 2 x Boa Li2; toe cap; seamless upper
• Fitmedium width, but true to size; slightly wider heel; flat toe box
• Price: 230 Euro >> available here

Evaluation & conclusion

The Fox Union fits like a glove and can be perfectly adjusted with the two Boa fasteners. Together with the firm upper material and the stiff sole, you put a lot of power on the pedals and stand like a rock in the surf when pushing through corners or riding down the fall line. However, the hard rubber could offer more grip. The direct feel tires the feet in the long run. Ankle protection would be an advantage for the intended area of use. When running, the Fox is one of the most uncomfortable shoes in the test, it rolls badly and bends uncomfortably at the midfoot. Absolutely overpriced.