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  • Giro Base Liner Bib Short - Men's
  • Giro Base Liner Bib Short - Men's Chamois
  • Giro Base Liner Bib Short - Men's Back pocket
  • Giro Base Liner Bib Short - Men's On-Model Front
  • Giro Base Liner Bib Short - Men's Back
  • OptionsGiro -
  • Detail Images - Chamois
  •  - Back pocket
  •  - On-Model Front
  •  - Back
GiroBase Liner Bib Short - Men's

Item # GIR00HG

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Item # GIR00HG

Requisite for shredding dirt.

We've all had uncomfortable chafing and irritation ruin a perfectly good trail ride, whether it's winding high above treeline in the mountains or pummeling over rocks on a desert mesa. Designed to keep this sort of irritation from ruining your ride, the Giro Men's Base Liner Bib Short delivers plush padding and form-fitting support that layers seamlessly underneath your trail baggies. Wicking mesh bibs stabilize these bib shorts in an upright fashion, but without annoying irritation or excessive body heat slowing you down.

Lightweight, form-fitting fabrics with ample stretch provide moisture-wicking comfort and uninhibited flexibility, complete with breathable mesh panels for cooling airflow while you're exerting yourself on the trail. Giro's Ase chamois provides plush, anatomically contoured padding that dissipates incoming trail vibration and chafing in the saddle. Another stand-out feature are three storage pockets along the upper back, so you can tuck all your riding accessories underneath your jersey in low-profile style.

  • Eliminates irritation and chafing from everyday trail rides
  • Fabric supports key muscle groups while preventing irritation
  • Breathable mesh panels for cooling airflow while riding hard
  • All-mesh bib straps keep bib shorts firmly in place
  • Ase chamois for plush, anatomically contoured padding
  • 3 expandeable storage pockets store goods under jersey
  • Leg grippers keep bottoms from riding up while pedaling
  • Fly opening allows for bathroom breaks on the trail
Tech SpecsSize
Tech Specs
[main] 79% polyester, 21% spandex, [mesh] 92% polyester, 8% elastane, [straps] 86% nylon, 14% spandex
9 in
Ase chamois
3 expandable pockets (at lower back)
mesh ventilation inserts
Recommended Use
cross-country, enduro, trail
Manufacturer Warranty
1 year


Men's Cycling Apparel
 Small MediumLargeX-Large  XX-Large

35 - 36in
(88.9 - 91.4cm)

37 - 38in
(94.0 - 96.5cm)
39 - 40in
(99.1 - 101.6cm)
41 - 42in
(104.1 - 106.7cm)
43 - 44in
(109.2 - 111.8cm)
 Sleeve 34in
  30323436 38
Natural Waist 29 - 30in
(73.7 - 76.2cm)
 31 - 32in
(78.7 - 81.3cm)
 33 - 34in
(83.8 - 86.4cm)
 35 - 36in
(88.9 - 91.4cm)
37 - 38in
(94.0 - 96.5cm) 
 Hip  36 - 37in
(91.4 - 94.0cm)
 38 - 39in
(96.5 - 99.1cm)
 40 - 41in
(101.6 - 104.1cm)
42 - 43in
(106.7 - 109.2cm) 
44 - 45in
(111.8 - 114.3cm) 
 Inseam  31.5 - 32in
(80.0 - 81.3cm)
32.5 - 33in
(82.5 - 83.8cm) 
33.5 - 34in
(85.1 - 86.4cm) 
34.5 - 35in
(87.6 - 88.9cm) 
How to Measure:
For best results, take measurements over your underwear.
Measure under your arms, around the fullest part of your chest.
Natural Waist:
Measure around your natural waistline, keeping the tape a bit loose.
Measure around the fullest part of your body at the top of your legs.
Using pants that fit well, measure the crotch seam to the bottom of the leg.
Measure from the center of your back to your wrist with arms held out.

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Love these

  • Familiarity: I've put it through the wringer

These bibs are perfect for the majority of rides. The chamois is comfortable and isn't too bulky. The fly feature is very convenient, and the back pockets are perfect for carrying snacks or small items like tire patches or plugs. I find these bibs fit great and are super comfortable for 95% of the rides I do.

Great bib short for the price

  • Familiarity: I've used it several times
  • Fit: True to size
  • Size Bought: Large

Really like this bib! The pockets are great! They keep your flat kit and water bottle super snug so there is no jostling around as you hit rocks and bumps. The chamois is nice as well. I have taken it out on some 2-3 hour rides and the chamois has done the job. If you are looking to spend under $100 on some bib shorts this is a great way to go.

Avg. ride time: 2h 46m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

So good

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

Super comfy chamois, great fit, and pockets for mini tool, snacks, spare bottles, etc. What more can you ask for

Love the tight pockets

  • Familiarity: I've used it several times
  • Fit: True to size
  • Size Bought: Large

Pretty nice bib liner! The chamois is decent, but I love how tight the rear pockets are. Keeps a flat kit, water bottle, or whatever else you need secure from falling out or rattling about. Great deal for $80!

Couldn't be happier

  • Familiarity: I've used it several times
  • Fit: True to size

I won't lie....these are my first bib liners. I have always used my typical bib shorts for under my baggies but I could feel the heat radiating from my legs. That is why I wanted to give these a try. I was pleasantly surprised with these liners. They are very breathable! The chamois seemed a little short in the front, however once you get in the riding position they felt great. They even have a fly for when nature calls on the trail! I've ridden in these for a little over 2 hours on a few rides and they did the job great! I will be purchasing more of these no doubt! The pockets on the back are perfect for a phone or flat kit. I love that I was able to carry everything I needed on the ride without using a pack or strapping stuff to my frame. I would highly recommend these to anyone!

Good for hot laps

  • Familiarity: I've used it once or twice and have initial impressions
  • Fit: True to size
  • Size Bought: Small

I've been using my trainer as a proving ground for different bibs this spring, and have put 2-1 hour session in on the Giro Base liners. The liners are lightweight, and breath well. Chamois is what you would expect for an $80 short/bib. That rear pockets are a nice feature, and are great for stashing a bottle or flat kit for a quick hour lap or so. I'd say the max for me on these is probably an hour, to maybe a 2 hour ride. Any longer than that, and I'll be reaching for a dedicated bib short.

Great MTB Bib Liners!

  • Familiarity: I've used it several times
  • Fit: True to size
  • Size Bought: Large

These bib liners are awesome! I've been using the Pearl Izume bib liners for the past few season, which are also great, but these Giro ones have a nicer chamois and a fly! They are exactly what I have been looking for! The chamois is great, the rest of the material is nice and light and stretchy, the pockets along the back hold everything you need (spare bottle, tool, snacks, key, whatever). The only negative compared to the PI bibs is that the straps are a little more noticeable on these. They aren't uncomfortable, you can just feel they are there more. Probably just a matter of getting used to them though.

Room for your stash

  • Familiarity: I've used it once or twice and have initial impressions
  • Fit: True to size
  • Size Bought: Large

At first glance I was a little leery about giving these a try. I wear bibs all the time on the road bike but for the MTB I wasn't sure if that's what I wanted to roll with. What sealed the deal into giving these a run was the three pockets on the back of the bib. I like to try and get away without carrying a pack while riding and for most short rides it’s not an issue, but once getting past an hour or so I need another water bottle and my frame only holds one. The pockets allow me to carry another water bottle, phone, snacks etc in the bib pockets rather than my short pockets which makes for a much more comfortable ride. Once under way you don’t even really notice that you have a bunch of gear stuffed in the back pockets.
I'm a 34" waist in my chubby trim and looking at the size chart that puts me in the large range. The top portion of the bib is really thin, see through and feels like nothing. They don't have a lot of stretch in the straps but for me I was fine with it and it fit my body type fine. 5’10” 32” inseam. The other thing I noticed is that the chamois stops short where most road bibs extend farther forward and that it has a fly like a regular pair of undies, so you can go to the bathroom very easily.
I loaded up the pockets and headed out. I even found a way to attach the chin bar of my helmet to the pockets so I didn't need my pack to carry that either.

I would have went with a 5 star review but this is the first time out in the bib and I feel there is a bit of room for improvement in the elasticity of the straps.