Fox Flexair Pants | Review

image collage of colin wearing the fox flexair mountain bike pants in black against a white wall

Fox Flexair Pants

Fox’s FlexAir Pants are extremely comfortable and surprisingly versatile. They’re lightweight, super breathable, and stretchy enough to allow for an uninhibited range of motion. I call them my “trail pj’s” because the first thought I had upon trying them on was “man, these are so comfy, I could wear them to bed!”

detail of ventilation on the fox flexair mountain bike pants in black

The Basics:

  • $139.95 USD
  • TruMotion® all-way stretch fabric
  • TruDri® fabrics move sweat away from the body
  • Ratchet fly closure
  • Zippered hand pockets
  • Tapered lower leg
  • DWR finish
  • Inseam: 31.75" - Size large
  • 88% polyamide nylon, 12% elastane

Features

What impresses me most about these pants are the TruMotion® and TruDri® fabrics. Very stretchy and impressively breathable, they’re also lightweight and soft to the touch. Wearing them feels like wearing pajamas or yoga pants that are made from a technical material and cut for mountain biking. The range of motion is impressive and durability seems to be on point. I’ve made it through a handful of crashes with surprising little damage. No huge ragdolls or explosions (knock on wood) but I've driven my knees into the dirt pretty hard and there are no noticeable tears or scuffs. After a wash the pants still look brand new. For how lightweight the fabric is, I'm pretty happy with how durable it's been.

image collage of colin wearing the fox flexair mountain bike pants in black

Breathability with this material is also awesome, making them perfect for spring and fall but they're also a surprisingly nice summertime pant in all but the hottest regions. If the material itself isn't breathable enough for you, there's also laser perforated ventilation on the front and back of the thighs.

detail of ventilation on the fox flexair mountain bike pants in black
detail of ratchet on the fox flexair mountain bike pants in black
detail of zipper pocket on the fox flexair mountain bike pants in black

The Flexair Pants feature a ratchet system at the waist which provides a simple and adjustable closure. I’ve heard criticism that these pants lack a fly zipper and belt loops but I found those to be unnecessary. The stretchy material combined with a generous range of adjustment in the ratchet system and plenty of overlapping material in the fly offers lots enough adjustability for me.

detail of ventilation and zipper pocket on the fox flexair mountain bike pants in black

The two front pockets have zippered closures and are reasonably sized with room for a phone, snack, or keys but the slim fit makes it less-than-ideal to pedal with stuffed pockets. They’re still functional for those who don’t use a fanny-pack or backpack, I just prefer to pedal with my pockets empty.

A DWR coating helps these pants shed moisture, but they are certainly not waterproof. Not compared to Fox’s purpose built wet weather riding pants, the Ranger 3L Pants. I find DWR to be a great solution to residual moisture from wet trailside brush but if you need truly waterproof pants for riding in the rain, there are better options.


Fit

image collage of colin wearing the fox flexair mountain bike pants in black against a white wall
image collage of colin wearing the fox flexair mountain bike pants in black against a white wall

    These pants are cut with a similar slim-fit to a lot of other pants out there, but they err on the tighter side. Reasonably slim through the thighs with a little extra girth around the knees for knee-pads, snug around the calves with some elastic at the ankle to making getting them on and off easier.

The waist fits true to size. I typically wear size 32 street pants and a size 32 Flexair pants fit great. I tried a couple different knee pads with the Flexair Pants and found that they fit best with a midweight pad or smaller. When I tried them with a bulker kneepad, they were a little too tight to pedal comfortably. Moving down from the knees, the pants taper to a pretty slim fit around the calves and ankles. For how snug they are around the ankles, they’re surprisingly easy to slip on. I found the fit to be pleasant, as I have medium sized calves and I also don't mind a snug fit in that area. TruMotion® fabric is fairly stretchy which keeps the snug fit from inhibiting movement at all. I did, however, talk with a coworker who found the Flexair to be unbearably snug around his calves. This is worth a thought if your calves are larger or you prefer a baggier fit.

detail of ventilation on the leg on the the fox flexair mountain bike pants in black

Final Thoughts

      The Flexair Pants are comfortable and versatile. They utilize a stretchy, breathable material that's thin and lightweight, yet surprisingly durable. The fit is reasonably slim with enough room in the knees to fit mid-weight knee pads but not so baggy that material flaps around when you’re rolling sans knee pads. Stretchy fabric keeps movements free and uninhibited and the ratchet system at the waist is easy to use, reliable, and offers plenty of adjustment. Ultimately, I really like these pants and I wear them for the lion's share of my riding in the PNW. To me, they're the perfect pants for any ride, warm or cool, as long as it's not burning hot or actively raining.

image collage of colin wearing the fox flexair mountain bike pants in black against a corvette


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ABOUT THE RIDER/WRITER

NAME AGE HEIGHT LOCATED

Brodie Hall

26

5'9"

Bellingham, WA

Current Bikes: Banshee Titan

Bike Size: Medium

Favorite Trails: Spacewolf, Galbraith / Graysill Connect, Coalbank Pass

About Me: I grew up in the San Juan Mountains of Southwest Colorado where high country epics are the local favorite. After moving to the PNW in the summer of 2021, I'm really loving the steep, loamy, and rooty terrain that Bellingham has to offer. Jumps are growing on me, but still not really my thing. Historically, my bike of choice is a mid-travel 29'er, but the steeper, faster terrain in this area has me curious about a longer-travel mullet bike.