Free 2-Day Shipping on Orders Over $50*

Assos iJ.tiburu.4 Jacket

Sale $143.40 $239.00 40% off

Item # AAS0066 Past Season Colors

Select options
  • Select options
  • Piton Green, L ($143.40)
  • 100% Guaranteed Returns
  • Free 2-Day Shipping
    on orders over $50

Item # AAS0066

The marriage of jersey and jacket

Our first full-zip long sleeve jersey was made by Assos. It was a closeout, and we felt pretty savvy for the purchase. But, expectantly, the top lasted and lasted. It was our go-to long sleeve jersey for a decade, and a few years in, we realized that the jersey would've been a bargain at any price. That old jersey was a direct ancestor of this iJ.tiburu.4 Jacket.

In Switzerland, the tiburu is a spring and fall jacket -- they call it climaRange 4. Depending on where you live, it's a jacket that works from early fall, through winter, and into late spring. Further breaking down the funny-sounding name, the iJ stands for Insulator Jacket, meaning the material is fleecy and warm on the inside -- a heavy jersey if you will. Assos iJ.tiburuUno Jacket DetailBecause you have to strike a balance between being cool and hot, the jersey uses RX fabric for the front panels -- both the chest and the parts of the arms facing the wind. It also uses the lighter RXQ for the back and the inside of the arms. This mix helps protect the body from the wind while allowing some heat to escape where the wind can't get to you.

The iJ.tiburu.4 also takes advantage of a technology that we've only seen thus far in Assos' jerseys -- a rear stabilizer system that's been highlighted by the gripper across the back under the pockets. This means that the pockets won't bounce or sag when they're full. This a welcomed cross-over feature, and one that we hope to see more and more often in the future.

Also standard fare here are the three rear pockets with one extra zippered pocket on the right side for valuables. There are reflective tabs sewn on the seam that join the pockets to the top.

The Assos iJ.tiburu.4 Jacket are available in the colors Black Volkanga, Red Swiss, and White Panther. The jacket also comes in six sizes from Small to TIR.

Tech Specs

[front panel] Assos RX, [rear panel] Assos RXQ
3 rear, 1 rear zip
not taped
Recommended Use:
winter cycling
Manufacturer Warranty:

Size chart


Men's Apparel
Leg & Knee Warmers 0 I II  

4ft 11in - 5ft 2in

(150 - 159cm)

5ft 3in - 5ft 6in

(160 - 169cm)

5ft 7in - 5ft 10in

(170 - 179cm)

5ft 11in - 6ft 1in

(180 - 185cm)

6ft 1in - 6ft 3in

(186 - 190cm)

6ft 3in - 6ft 5in+

(191 - 195cm+)

XLG but wider
Arm Warmers0III 















How to Measure:
For best results, take measurements over your underwear.
Measure around the widest part of your chest.

Reviews & Community


Write a review

    Add a:
  • Photos
  • Videos

No file chosen

Rather attach a photo from your computer?


Product Fit:

Runs smallTrue to sizeRuns large

Add Your Size


Height (ft, in):

Weight (lbs):

Size Purchased:

Only jpg, jpeg, png, gif or bmp files please.

Submit ReviewCancel

I love it

  • Familiarity: I've put it through the wringer
  • Fit: Runs small
  • Size Bought: large

I agree with what many of the earlier reviewers have written: this item nicely straddles the heavy jersey/light jacket category. I've worn it in weather from 40-65 degrees by varying my base layers from Assos summer level 1 to winter 4. Pockets are exceptionally useful and accessible. Large fits me "loose" without flapping.

great hard training jersey 45 degrees f.

  • Familiarity: I've used it once or twice and have initial impressions
  • Fit: Runs small
  • Size Bought: large

I'm 5'9", 161 lbs., 40" chest, 32" waist, got the large and glad I did. Had originally bought the Assos Intermediate jersey and found that had zero insulation so no help for riding in the 40 degree f. temps around Chicago, sent that back & instead got the Tiburu. This is definitely more of a jersey than jacket: nice insulation on body, but not too much; hardly any on the sleeves which is good & bad. Good for hard training but you'll definitely be cool/cold when warming up if no long sleeve base layer and it's in upper 40s. With better insulated sleeves would have been able to wear into lower 40s comfortably. My optimal temp range for this garment: 1) upper 40s: short sleeve base layer; 2) lower 40s definitely long sleeve base layer & if windy, vest. Don't know where some of the other reviewers live, but the Midwest has "real" winters (below zero f.) so most of the time when it's in the 50's I just wear a base layer, regular short sleeve jersey and arm warmers, which if sunny, get rolled down. And if it's in the 60s, I sure as heck wouldn't be wearing a thermal jersey! The off color green actually matches our team colors so it works for me. And the 40% off definitely made it a no-brainer. Minimal insulation in the arms made for only 4 stars. I like it but....

The best light jacket/jersey I own

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

The first time I wore this, I was not sure what to expect. It was from 50 - 60 degrees outside and I also wore a light base layer underneath. Was not cold at all - and not warm, either. Perfect. Just what I was looking for. I have other L/S jerseys but they are more fleece-y and when I perspire, they don't wick well. Also, they do not block wind. This jacket/jersey does both I think it's a jack-sey. Buy it and enjoy.

My favorite cool weather jersey

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

I bought one to try out on sale, and loved it so much I bought 4 more. I've worn it in temps ranging from the low 40's into the upper 60's, and with proper layering, is an extremely versatile garment. I generally wear a Castelli windstopper short sleeve baselayer under it in temps under 55-58 degrees, and if it gets really cool (low/mid 40's), I'll wear a lightly insulated vest over the top of those two layers. The arms get a bit cold under 50, but I find this also helps to regulate my body temp as well and I tend to not overheat as much. The jersey (I don't really consider it a "jacket") is extremely comfortable, and fits me well....the rear pockets are large and easily accessible. I got caught out in the rain in 47-48 degree temps with just this jersey on with the Castelli base layer underneath, and was actually fairly comfortable - my legs, not so much, as I had left my knee warmers at home, but the jersey still insulated very well when it was soaked. I actually look forward now to riding in the cooler temps with this jersey.

More long sleeve jersey than jacket.

  • Familiarity: I've used it once or twice and have initial impressions
  • Fit: Runs small
  • Size Bought: Small

It does run a little smaller than the Intermediate Evo 7 but once in the riding position I forget I have it on. I normally wear a base layer underneath with no problems. I usually use it for flat and hilly rides between 50 and 65 degrees. For climbing in the same conditions I use the Intermediate Evo 7 as I believe it has better wind protection.

Waist 29 in
Chest 38 in
Neck 15 in

Good heavy weight LS jersey

  • Familiarity: I've put it through the wringer
  • Fit: Runs small
  • Size Bought: Medium

I use this when it's in the 40s, layered with a mock turtleneck base layer. It's kind of a cross between a heavy weight jersey and a light jacket. Like all Assos stuff, the quality is first rate, the performance is excellent, and it's a bit over engineered. As for the style, either you buy into the Assos look or you don't. At full price, honestly not worth it, but a great deal when discounted. Standard Assos Euro fit, similar to Castelli.

early review..nice

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

bought this jersey/ jacket about 2weeks ago and have ridden 3x in 35 to 40 degree weather. i have a thermal p izuma winter jersey and warmth wise pretty equal. riding with ua cold gear mock turtle neck layer underneath and thermal arm sleeves. assos could use a taller neck area for colder rides( [ izumi neck works btr.. more warmth) assos fits btr and looks btr, overall quality real nice. i have other assos's jersey and thr my go to. ovrall this jersey/jacket is real nice and worth at 130 on sale. got a grab assos wen its on sale. peace paul t

Great "Jersey"

    The title of this piece is a bit deceiving, it'€™s a great addition to the gear, closet nonetheless. I use the Tiburu as a long sleeve jersey on fall/spring days when temperatures are in the 50'€™s. I layer with a skinfoil and this and use a wind jacket for the descents. Many of my customers rate this as their favorite piece.
    The material is soft and conforms nicely. I always take the BlitzFeder for descending on most of the climbs here in SLC, there is minimal wind protection. Sizing: I typically wear a small in Assos jersey’s and this fits just like a jersey. Feel free to reach out if you have any questions and/or concerns about fit for this or any other Assos piece.

    Size Purchased, SM

    Waist: 32in
    Chest (under your armpits, around the fullest part of your chest): 37in
    Neck: 13.5in
    Sleeve (shoulder joint to the wrist bone): 22in
    Bicep (relaxed - not that it matters in my case) : 10.75in

    Bill Sherman
    Customer Account Manager-Bike
    Office: 801-204-4545

    Great "Jersey"

    How is this jacket different from the intermediate jersey?

    Think of the Intermediate as the best long sleeve jersey out there, and the TIBURU as the best long sleeve insulator jacket out there. The TIBURA has better protection against the elements and much warmer. Give me a call - happy to help out:)

    Is this jacket good for riding in drizzle and light rain?

    The Tiburu feels more like a medium weight jersey rather than a jacket. It is not designed to be water repellent. It's OK in a light drizzle but it's best to carry a light weight rain jacket in your pocket and use that over the Tiburu if the rain hits. I have 2 of these and this is my favorite long sleeve jersey. Hope this helps you.

    no , its more for riding in dry cond.

    As sexy as it looks

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

    I'm 5'10', 155, with a 39in chest and upper arms that are larger than traditional cyclists. I got the Medium. It's snug in the chest, barely enough room for a base layer, but it stretches nicely and the arms and shoulders are perfect, not too tight. The fabric is super comfy. My only complaint is that the bottom zipper fitting is small, not easy to use with gloved fingers. I predict the zipper will be the first thing that will wear out, but hopefully not very soon!

    Avg. ride time: 6h 13m per week
    • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

    dope !

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

    Great investment !

    Assos's essential . Warm , ultra light , flexible , breathable. Feels areo. Dope !

    Temperature wise : 5 C - 15 C ( with lighter or thicker Assos base layer , feels comfy ) Chest has light wind protection , so riding in the wind its not a problem.

    Sizing . I bought L , Im 5.11 . 175 lbs. I have lean body type. If you have normal body type , buy XL .

    dope !

    thx im 5 11" and 180 and wear xl on all my jerseys. athletic build , not skinny and im going to go ith the xl. need for eastern pa fall/winter/spring riding. this should work and the price is good

    Will anyone comment on sizing? True to size? Size up one? Thx!

    True to size...but could size down has good stretch ability without sacrificing its strong points...pls take note U will need a windproof base layer when necessary very warm JERSEY !

    True to size...but could size down has good stretch ability without sacrificing its strong points...pls take note U will need a windproof base layer when necessary very warm JERSEY !
    Best Answer

    FYI; I'm 5' 8.5" 161 lbs, 32" waist 41" chest, muscular trim physique...I have this Tiburu.4 in size large. Race fit on me. I can wear a light weight base layer under the Tiburu, but nothing else. More of a jersey than a jacket. A bit flashy looking but great piece of clothing.

    It depends on the size of your waist. I'm a 32 inch waist and 39 inch chest and got a medium which is snug across the torso. I could have gone up a size but then the arms would be way too long as they are overly long now.

    Just to throw some more confusion on the sizing discussion I have 2 Castelli long sleeve jerseys. A Classica thermal which is a large (37-39 in chest). A Puro which is a small. Both are nice close fit (Puro a little tighter). Neither one is baggy nor bunches up. The Classica I can easily wear a midweight baselayer underneath. The size chart can be the same for 2 different jerseys and yet you can wear 2 different sizes.

    2nd question on Assos IJ.Tiburu.4 Jacket, what is the temp range, i.e., warmth down to 35 degrees, 45 degrees, etc?

    Best Answer

    This jacket has a rating of 4, Fall, in Assos' Clima Range. Meaning 60-50F, maybe cooler temps with a baselayer. I would take the Clima Range as a guideline though since cold sensitivity varies from person to person. See:

    38/40-60f ( lighter or heavier base layer )

    how is it washed?

    Best Answer

    I wash mine on the delicate cycle in a front loading machine. Drip dry. If I pull it out before 7 pm it is completely dry by ride time the next morning.

    It wil last longer if hand washed.


    • Familiarity: I've put it through the wringer

    Like most people, I was quite put off by the price of most everything in the Assos line. I tried numerous other long sleeve jerseys from other companies but always found that the fit was off, it didn't breath well, or didn't really offer any warmth. I enjoy my long, cold, winter training rides and needed a top that could cover a pretty broad range of temperatures throughout the day and be comfortable the whole time. In my opinion the Tiburu is the perfect top. I've done long easy rides, threshold climbing days, cold weather group sufferfests and everything in between. I've never had one complaint. It's my go to jersey when the weather gets below 60 and with a light rain/wind jacket I've ridden in snowstorms in the mountains. When finances allow I'll be getting another one because I'm getting sick of hand washing it every day so it's ready for the next ride.

    I noted with interest that you refer to this as a jersey while Competitive Cyclist calls it a jacket. Is it more like a jersey or a jacket? How's the wind resistance? Thanks!

    It wears more like a long sleeve jersey, but is warm like a jacket. (Think arm warmers for your torso). It's not really wind resistant like dedicated soft/hardshell jackets, but for hard training rides that's a good thing. I always find that wind resistant clothing gets too hot when I'm riding hard. With a light base-layer, I use it down in the 40s, and I've been comfortable returning from rides when it got back into the low 60s. If there's a particularly cold wind or I'm riding easy I just throw a wind vest on and it's perfect. I prefer the flexibility to add or remove wind-proof layers, rather than being stuck with one thing. Murphy and the weather always team up to bite me on that one.

    That's been my experience, as well. 60s it gets pretty warm for me, but 40s and 50s it is also my favorite jersey—I don't call it a jacket either!

    I've never worn the intermediate on rides, but have tried it on. Fits similar, but didn't feel like it would be as warm as the Tiburu. I have since bought a second Tiburu because I wear it so much now that I moved back to a colder climate.