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AssosMille GT Ultraz EVO Winter Jacket - Men's


Item # AASZ01G

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  • blackSeries, L ($369.00)
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Item # AASZ01G

Mille GT Ultraz EVO Winter Jacket

Winter training on the open roads is not just a test of your resolve, but it’s also the season to experience cycling on deserted roads and climbs whose chilled pavement and snow-lined shoulders turn away the more fragile cyclist. Assos’ Mille GT Ultraz EVO Winter Jacket insulates your core on rides such as these and protects your motivations against harsh winter climates as you churn out the base miles. Updated to add increased protection and warmth throughout the entire jacket, Assos starts with the front and upper back — which face winter head-on — and combines their triple-layered NEOS Light and RX Heavy fabrics for windproofing and water-repellency. The sleeves are fortified with the breathable yet still winter-ready, two-layer NEOS Ultra and 652.RX fabric, while the back panel uses a three-layer, winter-proof and breathable soft-shell, NEOS Medium. Assos looks at the entire system as combining the highest performing materials to meet the required goals of keeping you warm and protected as you train.

Assos uses targeted stitch patterns to ensure a full range of motion in the riding positions, while the center-weighted pockets are held tight and stabilized for comfort. The Tripe Ramp pockets themselves create “lids” over your cargo to add security and peace of mind, as you don’t want to be losing your phone in deep-winter training. The full-length zip helps manage overall heat buildup, and the regular fit of the Mille GT Ultraz accommodates your favorite baselayers without adding bulk that would catch in the winds.

  • Mid-winter cycling jacket for dedicated cyclists
  • Blend of elite, winter-ready materials holds warmth and protects
  • Breathable, windproof, and water resistant NEOS fabrics
  • Regular fit for adding extra layers of comfort
  • Reflective accents on sides and center-pocket

Tech Specs
Material[front/upper back] NEOS Light, RX Heavy, [sleeves] NEOS Ultra, 652.RX, [back panel] Neos Medium
Waterproof RatingNEOS Medium (>10,000mm)
Breathability RatingNEOS Medium (14,600g/m2/24h)
Windproof Rating100%
Lengthwaist, drop tail
Center Back Length[medium] 27in
Pockets3 covered rear
Manufacturer Warrantylimited


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.

What do you think about this product?


>Rating: 4

Great jacket from 35-40 degrees

I've used it once or twice and have initial impressions
True to size
Size Bought
155 lbs

It is a well co trusted jacket. Wind proof and I wore it w a base layer. Once you get riding it is good. I did find my arms getting reallly warm and had to vent. My sleeves not to sweat. Maybe since I had a long sleeve base layer. I haven’t tried with the below 30 weather. I think it would be fine with more layers. It is a little roomy not as super fit as other assos I have since believe that is was designed like that. 6’ 155lb. Wore a large. I wish it was a little tighter fitting.

>Rating: 1

Winter Riding Apparel for the Pefect C.

5` 7"
137.2 lbs

How come you have all this nice stuff just for men???? Do you believe Women don't want to go out on the bike in the winter ? I am really getting ticked off at receiving emails like this ! Sent these ads to men Theres Geering, a woman road rider (Peter is my husband)

Height 5’3” Weight 117 lbs Theres Geering, absolutely agree. I have to buy Assos’ men small to get the quality and colors I prefer. Linda, Ed’s wife.

You give a product a poor rating simply because you want to voice your dissatisfaction with gender bias? You think that’s fair and helpful?

>Rating: 5

Great product

I've used it several times
True to size
6` 2"
190 lbs

Well worth the money.

>Rating: 4

Yeah, it's warm...

I've used it once or twice and have initial impressions
True to size
Size Bought
5` 8"
155 lbs

Ok, first and foremost - it's warm. Started my first ride in it this morning at 37 degrees with a 32 degree wind chill. Only a light merino LS base layer underneath. 20 minutes in, and I had to pull the zipper down just a bit to allow some cold air in. To be honest, at this temp I may actually just wear a short sleeve base layer and see how the jacket handles it. As far as the fit goes, if you're a medium in everything else, get a medium. It's snug of course, but pretty much disappears on the bike. I'm 5'8, 155lbs with maybe a 38 chest if that helps. The sleeves are pretty cool - they're actually two piece as the warm, soft material isn't sewn to the outer windproof layer, so you can tuck the under layer into your gloves and pull the outer cuff over the top. I liked this feature. A couple of "maybe" negatives for me - first of course, is this thing is expensive. But if you're reading this pending a purchase, you've already probably swallowed that so YMMV. Second - when I got home and peeled this thing off, my base layer was pretty darn wet. Now maybe that's a function of the merino wool, a negative strike on this jacket's breathability, the fact that it really wasn't frigid out, whatever. Just figured I'd point that out if you're expecting this to keep you bone dry. It didn't. Beyond that, it kept me warm (almost too much at this temp) and I guess that's what you're looking for in a winter jacket, right? Oh one more thing - if you've read previous reviews, make sure you know that this is the "updated" version (2021?). It does not include the built in neck warmer/buff, which I was kind of looking forward to. Guess Assos decided that this wasn't worth continuing. Edit - a month in, and this is clearly the gold standard of winter jackets if you're riding in the cold. I've been down to 22F so far and this thing just shrugs it off like you're sitting on a summer beach. My upper limit before I'm just too warm in this jacket is maybe 43/44F. It's that warm but not even remotely "bulky". Assos killed it with this jacket. Think it's time to pick up the matching bib tights to see how ridiculously cold I can go....

The new GTO Bib tights are not the same. They say they are rated for the coldest Temps but they lack windproof fabric anywhere but the cup and they start to get chill under 40F even worse at freezing. So expensive but not worth it for the cold, only comfort.

>Rating: 5

Proper Winter Jacket

I've used it once or twice and have initial impressions
True to size
Size Bought
5` 10"
190 lbs

Wow, finally a jacket that is comfortable, wind-proof and warm from 45 F down. My main issue with my other winter jackets was the wind protection, especially in the arm sections. I took this bad boy out the other day with the temp starting at around 36 F and ended around 45 F. Wind was between 12-16 MPH. I wore an Assos, long sleeved, winter skinfoil 4.4 base layer under the jacket. First 15-20 minutes of the ride, I was questioning my purchase. After an hour on the bike, I was noticing that I was comfortable and not thinking about the weather. 2 hours into my ride I was not thinking about the jacket at all (it was doing its job). Especially when I was riding straight into a head wind of 16 MPH for numerous miles. I could not feel the wind through this jacket!!!! After my three hours in the cold was up, I was contemplating buying a second jacket in the lollyRed (just joking!). This is an outstanding jacket. Once you get over the $369 price tag, everything else is great. In this instance, you get what you pay for. If you are looking for a winter jacket that will battle the cold and wind, look no further. The jacket actually does everything it claims to. I am a 51 year old, 5'10", 190 lb. weekend warrior rider. I only ride 2 times a week. Each ride is between 50-60 miles. I am in great shape, but would definitely be considered a "bigger" rider in the peloton. I usually wear an XL in all of my Assos Kit. I did go up to the XLG because I felt the XL was just a "smidge" too tight. After I wore the jacket on my first ride, I probably would have been OK with the XL, but I like the "roomier" fit of the XLG for my winter rides. I can not wait to see what the limits (cold temp) of this jacket will be. I feel that with my winter Assos skinfoil 4.4 base layer, I should be fine down to low to mid 20's F.


i just ordered and received a large Mille GT jacket ULTRAZ winter men's large. I am not large at all (5'9"/170), but the jacket is way too tight in the arms and shoulders. I usually wear medium to large regular shirts/etc, but this is not close. I'm not even sure an XL would be comfortable. Would like to know what to do.

Hey Peter, thank you for reaching out. Some of the Castelli Pieces fit a little tighter due to the materials used, as well as the intended fit. We do see riders sizing up, but before you do, I would encourage you to try the piece on in the riding position. When standing straight up, the cycling fit usually creates added tightness in the shoulder area, to allow for better comfort when actually riding! You can always try the next size up to see if that makes for a better fit, and know in doing so, that you are not the only one!