Fat Jack Pant

Built For: Cold weather Riding

Size Guide


Technical and robust, our Fat Jack pant was designed for the epic fat-bike ride on miles of winter single track. Don’t have snow? Don’t fret, the Fat Jack performs in dirt and on pavement just as well. Our stretch, water resistant double weave fabric with durable canvas leg patches deliver the workman’s pant in a technical package. Reflective accents add night time security. The side leg pockets store all of your goodies securely behind a reflective bound zipper or open them up for full upper leg ventilation.


Fabric | Mid-Weight Polyester Double Woven Stretch Fabric

Fabric Content | 90% Polyester / 10% Spandex

Fabric Weight | 220g/m2

Product Details

Storage | 2 Front, 2 Zippered Leg, 1 Zippered Rear Pocket

Media | Media Port on Leg Pocket

Articulation | Articulated Knees & Gusset For Improved Range of Motion

Finish | DWR Finish for Water & Wind

Ventilation | Zippered Pockets Double For Ventilation

Visibility | RideLight Reflective Accents

Inseam | 33"

Fit | Comfort

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Fat Biking Winter Bike Pant

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Customer Reviews

Based on 67 reviews
Very comfortable

Super high quality and fit perfect. I’m exactly 6’ tall and weigh 200 lbs, normally wear a size 34 / 32 in most jean brands (sometimes 33 waist) and size Large worked perfect. Would prefer the back pockets to be a little larger, that’s my only minor complaint.

If you fatbike, get these pants

I have tried a suite of different pants for fatbiking. Some are too hot, some allow too much wind through, fit too loose (particularly in the crotch so they get hung up on the saddle, or in the ankle so you get them stuck in the chain. These pants have none of these problems. They are also priced very well! I highly recommend them. If you ride in very cold weather (say below 10 degrees Fahrenheit) you can ware thermals under them. This is a big help rather than having heavy weight pants that overheat you at warmer (and by warmer, I'm still talking below freezing) temperatures.

NH winter rider - highly recommend

Large are perfect for 5 10 170 pound 34 waist rider. Ideal cut, material weight, stretch. Great to wear over summer short bibs for T 35 to 50F or over medium-heavy bibs for down to 0. Added some ski suspenders with loose waist, perfect for long rides on gravel or fatbike. Also put some d30 661 padded knees and shorts under for sketchy ice rides, excellent Breathable, but cut wind nicely, haven't needed to use side vent zips yet. Highly recommend.

Couldn’t be happier

Fit great I’m 5’11” 180lbs bought the large, rode in 10 degrees weather and stayed nice and warm with just a pair of shorts on underneath, the cuffs were clear of the chainring. Only complaint is the snap takes a lot of force to engage.


This is the 3rd pair of Fat Jack pants we have purchased. My husband loves them so much! they fit wonderfully and do not bunch up in the crotch or pull down in the back when you're pedaling.
Awesome piece!

Men's Bottoms Sizing Chart

This a COMFORT FIT style and fits true to size. For more information on the difference between comfort and sport fit click here.

Club Ride Mountain Bike Apparel Size Chart