Assos Mille GTO Short Sleeve Jersey S11 Info

The Assos Mille GTO Short Sleeve Jersey S11 is the latest refinement of Assos's flagship endurance jersey — lighter, more breathable, and better organized than its predecessor, without giving up any of the luxurious all-day comfort the GTO line is known for. At $280, it sits at the top of the road jersey category, and every detail justifies the position.

The body fabric is Sens Air, a new-generation textile that replaces the previous GTO's main material with something meaningfully lighter and more breathable while retaining the same ultrasoft next-to-skin feel. The 75% polyamide, 25% elastane construction provides just enough body-mapping stretch to keep the jersey in place without restriction, and UPF 50+ protection is built in throughout. On the back, the Stabilizer V11 panel — 100% polyester, ultralight — spans up to the shoulders, adding structure that prevents the pockets from sagging or shifting under load. It's the kind of detail you notice on hour five, not hour one.

The fit is shaped by LouvreTec construction: set-in sleeves and strategic darting at the collarbones and across the back remove the material that typically bunches in an aggressive riding position. The result is a jersey that looks as clean from the side as it does standing still — no wrinkling, no excess fabric pooling at the front. Assos calls it regularFit, but it's engineered specifically for time in the saddle, not for a relaxed street silhouette.

Storage has been overhauled for the S11. The Triple Ramp Pocket system uses a seamless zeroSeam construction with increased depth and stability — capable of carrying CO2 cartridges, nutrition, and hydration powder packets without bouncing or stretching out of shape. A separate zippered side pocket keeps personal effects — keys, cards, phone — isolated from ride essentials. Diffusor valves and a central rear reflective stripe provide 360-degree visibility when the light drops.

Specs at a Glance

Main Fabric: Sens Air — 75% Polyamide, 25% Elastane, UPF 50+
Back Panel: Stabilizer V11 — 100% Polyester, ultralight shoulder-to-hem support
Construction: LouvreTec — set-in sleeves, darted collarbones and back
Pockets: Triple Ramp (zeroSeam) + zippered side pocket
Reflectivity: Diffusor valves + central rear stripe, 360°
Fit: regularFit — all-day endurance comfort
Temperature: >70°F / Breathability: 5/5 / Packability: 5/5
Colors: Blackseries, Deadly Berry, Edge Green
Sizes: XS–3XL

Design Benefits

Sens Air main fabric — lighter and more breathable than the previous generation, UPF 50+, stays soft against the skin on long efforts
LouvreTec construction — strategic darting eliminates bunching at the collarbones and back, clean fit in every position
Stabilizer V11 back panel — shoulder-to-hem structure keeps fully loaded pockets from sagging or shifting
Triple Ramp + zippered pocket — organized storage that keeps ride fuel separate from personal items

Final Take

The Mille GTO S11 is what a serious endurance jersey looks like when every detail has been iterated on over decades. If you're riding long enough that jersey comfort starts to matter, this is the one to reach for.

The RA Perspective

The Mille GTO has been in our inventory for years across multiple generations, and the S11 is the best version yet. The jump from the previous generation isn't dramatic — this isn't a reinvention — but the specific improvements Assos made are exactly the right ones.

The Sens Air fabric is noticeably lighter and more breathable than what came before it, and that matters most on warm days deep into a long ride when you want airflow and not much else. It still has the body-mapping stretch and next-to-skin softness the GTO line is known for — it just gets out of the way better than the prior version. UPF 50+ coverage throughout is a bonus for summer riding.

The pocket system is where we've seen the biggest real-world difference. The Triple Ramp construction keeps everything organized and stable even when you're carrying a full load of nutrition and CO2. The added zippered pocket might seem like a small thing, but having a dedicated, secure spot for a phone or key card separate from your gels and wrappers makes a genuine difference on longer rides. We've had customers specifically mention this as the feature that sold them.

One thing worth noting: the regularFit runs true to the chest measurements on the size chart, but it's cut for the riding position. If you're primarily wearing it off the bike or want a relaxed fit, size up. On the bike, it's exactly where it should be.

Assos Mille GTO Short Sleeve Jersey S11 Size Chart

ASSOS Men's Jerseys, Jackets, and Shells Sizing

Size

Chest (cm)

XS

88–91

S

92–95

M

96–100

L

101–106

XL

107–113

2XL

114–121

3XL

122–129

GTO is a go!

Assos kit is really good. The GTO line is spectacular! Expensive, but worth it.

Assos Mille GTO Short Sleeve Jersey S11

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Assos Mille GTO Short Sleeve Jersey S11