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AssosTrail Liner Shorts - Men's


Item # AAS00BG

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  • Blackseries, S ($129.00)
  • Blackseries, XL ($129.00)
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Item # AAS00BG

Trail Liner Shorts

  • Assos liner short for its mountain bike baggies
  • Use its OFFROAD insert with 10mm of memory foam and elastic insert
  • Targeted thickness at the rear for optimal comfort and support
  • 3D waffle perforated foam increases breathability and eliminates excess weight
  • Aerofit warp-knit is woven with an open structure for maximum ventilation
  • Removable and flexible impactPad has a perforated surface for breathability
  • goldenGate technology interrupts the stitching along the insert for more three-dimensional freedom of movement
Tech SpecsSize
Tech Specs
78% nylon, 22% Elastane
OFFROAD insert
Chamois Thickness
Recommended Use
enduro, trail
Manufacturer Warranty


Men's Apparel
Leg, Knee, Arm Warmers0III 

5ft 3in - 5ft 7in

(160 - 170cm)

5ft 7in - 5ft 9in

(168 - 175cm)

5ft 8in - 5ft 11in

(170 - 179cm)

5ft 11in - 6ft 2in

(180 - 187cm)

6ft 1in - 6ft 2in

(185 - 189cm)

6ft 3in+



< 132lb

(< 60kg)

< 154lb

(< 70kg)

< 165lb

(< 75kg)

< 176lb

(< 80kg)

< 187lb

(< 85kg)

< 198lb

(< 90lb)

> 198lb

(> 90lb)


27.5 - 29.1in

(70 - 74cm)

29.2 - 31.5in

(75 - 80cm)

31.6 - 33.8in

(81 - 86cm)

33.8 - 36.2in

(87 - 92cm)

36.3 - 38.9in

(93 - 99cm)

39 - 41.7in

(100 - 106cm)


















Note: Assos clothing has a very slimming, anatomic cut, if your build is less than slim or if you like your fit looser, go up in size.

How to Measure:
For best results, take measurements over your underwear.
Measure around the widest part of your chest.
Bend to the side and measure around the place where your waist bends, keeping the tape a bit loose.

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Does the job

  • Familiarity: I've put it through the wringer
  • Fit: True to size
  • Size Bought: Medium

Great fit and very well made. However, the chamois really soaks up the butt sweat so make sure you lube up before your ride.

as good as it should be with that price.

  • Familiarity: I've used it several times

super high quality, fits well; great chamois;
shorts have the perfect compression.
sz 30 waist - medium

They maintained the reputation

  • Familiarity: I've put it through the wringer
  • Fit: True to size
  • Size Bought: Medium

The bar was high for me when getting these liners. Assos has set the bar on the road chamois for years, what do they know about MTB? Apparently a lot. The liner carries the same top-tier chamois you would expect with added details that matter, like hip-pad pockets. The liner is not too long, which I love and sits nicely. The chamois is hard to rival on 5+ hour days in the bike but still doesn't fell like a diaper when having your after ride beer. Frankly, others will have to step up their game in the MTB liner category with this on the market.


  • Familiarity: I've put it through the wringer
  • Fit: True to size
  • Size Bought: Medium

I must admit, I am always a little skeptical when predominantly road-oriented brands enter the MTB space (or vice versa). It is clear with these liners that Assos has done its homework, and brought much of their top-of-the-line technology and attention to detail to the MTB space. How refreshing!

I've now logged 200-250 MTB miles in these in various conditions - hot, humid, rainy, cold, snowy, muddy, etc.

When you take these out of the box, the construction will impress. Wearing the liners only takes that up a notch. The laser cut waist and legs help me forget I'm wearing them. The liner includes two small pliable hip pads that slip in easily -- they are perfect to help take the edge of that unexpected fall when you send it. The chamois is ideal for longer rides -- I'm secretly hoping they introduce a minimalist version as well for quick shuttle laps!

Unlike my experience with Assos road wear where I always must size up, I've found these to run true to size.

Well done, Assos!


  • Familiarity: I've used it several times
  • Fit: Runs small
  • Size Bought: Large

All I can say is wow. I had ridden Assos road gear in the past, was always happy with the fit and function so when time to purchase new MTB gear, I figured I would give this a try. I purchased the Rally short, trail liner and trail short sleeve jersey. First impressions brought in by the packaging alone led me to believe I was in for a treat...really nice touch. Upon opening the packages, the feel and quality of the finish delivered. As good as it looked and felt, I immediately thought; "how good can it be?", then i put it on. The fit and overall comfort is incredible and on the first ride I literally forgot i was wearing anything. Luckily for other trail users, the clothes were really there. The waist bands are probably the nicest fitting and comfortable I've experienced, the jersey is both loose and snug in all the right places. I was left completely impressed and will definitely purchase more. Only thing to consider is sizing when buying this. I'm typically a U.S> medium in most everything, but I sized up to large and was good to go.