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Fox Racing
Union BOA Flat Mountain Biking Shoe

5 out of 5 stars
2 Reviews


Size Chart


Why We Like The Fox Racing Union BOA Flat Mountain Biking Shoe

For those of us who prefer flats when we are shredding the trails, our world of technical mountain bike shoes just got a bit brighter. Fox Racing finally brought the BOA Fit System to their flat pedal shoe lineup, giving us the Union BOA Flat Mountain Biking Shoe. This shoe features a one-piece molded TPU upper with mesh cutouts for breathability and durability. The BOA Fit System featuring dual Li2 dials provides a super quick and secure closure system, and the high and low arch support gives us a support and comfortable fit. A molded toe cap wards off rock strikes, and the EVA midsole cushions our feet and absorbs impacts.


  • Technical mountain bike shoes for use with flat pedals
  • Dual BOA Fit System makes for a secure and simple fit
  • Molded toe cap designed to shrug off rock strikes
  • High and low arch support provides comfort and a custom fit
  • Ultratac rubber compound keeps us connected to our flats
  • EVA midsole for vibration damping and impact absorption
  • Item #FXRZ57L
Upper Material
TPU, mesh
BOA® Fit System featuring Li2 dial
Ultratac rubber
Cleat Compatibility
Claimed Weight
11.5oz (327g)
trail, enduro, downhill
Manufacturer Warranty
limited 1 year

Overall Rating

5 based on 2 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 0 reviews
3 Stars - 0 reviews
4 Stars - 0 reviews
5 Stars - 2 reviews

Fits True To Size

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

What do you think about this product?


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5 out of 5 stars

July 2, 2024

Quality and Comfort in a Cycling Shoe

I've used it several times
Size Bought:

I bought these shoes about 6 weeks ago and wear them while riding one of my road bikes that does not require cleats. I love the dual BOA for adjusting to my fit and comfort level, and the shoes are just comfortable and fit my feet well. I highly recommend these shoes.

5 out of 5 stars

June 10, 2024

Game changer for grip and ease of use

I've used it several times

I almost bought new pedals until I got these shoes. Amazing grip. So nice to quickly tighten and loosen. Worth every penny


Originally reviewed on Backcountry.com