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Assos cS.Uno Skinsuit - Men's
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How Assos renames "fast."

Thanks to the march of technology, skinsuits are not fast enough; you now need a swiftsuit in order to keep up. Assos has taken up the challenge and offers a one-piece suit that is faster than your skinsuit, the cS.Uno. cS is short for Chronosuit, which is an outfit for shaving time.

The Assos cS.Uno is faster in a number of different ways. For one thing, it was designed to fit right only when in a racing position. When you contort yourself into it, it will feel too small. Stand up straight, and the front of the neck will pull down to the point that people might politely tell you that you should have sized up. Smile when you hear this. It means it fits right.

Loose clothing is slow clothing. Ripples in fabric flap when wind passes over them and disturbs the air flow. So Assos has finger-loops at the ends of their sleeves so the sleeve won't ride up the wrist and leave extra fabric for the wind to grab.

Assos also made the cS.Uno faster by mixing in different kinds of spandex for the different panels. See the shiny stuff? Look at how the quad panels reflect light. This material is slipperier to the wind, called "low volume, low air resistant spandex." But they haven't made the entire suit out of it because it doesn't breathe well. So they use it strategically.

Likewise, they have A.Plethon spandex for the sleeves. This material is stretchier than regular spandex. Good for places where you need some movement. It also allows the suit to fit a wide range of body sizes. But if they made the whole suit of out this, it would be too stretchy. The rest is Assos' regular Type A430 spandex. Leg grippers are stitched to the edge of the short legs; it's a design Assos has found more comfortable than running the gripper under the edge.

This being Assos, there are a few things you can't see. There's a mesh radio pocket inside the suit. You can find it in the back, stitched to the seam between the top and the bottom, in the middle. They also have a small external zip pocket. It is also on the seam between the upper and lower halves of the suit. It's a small slash pocket atop the right glute. This is where you can stow your gel packets rather than have them sticking out of your short legs.

Sizing is important for the Chronosuit, possibly even more important than it is for shorts. Because you're supposed to stretch this skin around your body, follow the height measurement more closely than the weight measurement when deciding which size should fit you best. Because the shoulders have extraordinarily stretchy spandex, it will stretch to accommodate height.

Since the Chronosuit is a top-shelf item, Assos could only stitch in its primo FI.Uno_S5 chamois, the same one you find the S5 shorts. The new chamois is actually two separate pads with two separate stitchings. The layer next to your skin is softer than what you get on the S2. While it lacks in none of the elasticity of the original FI.13 chamois, it somehow feels less rubbery than the original. When it's being stretched, it doesn't try to snap back into place, so it won't abrade your skin as much. The chamois is dimpled, too, to facilitate heat ventilation. You'll also note a broad cut at the front of the chamois to further reduce pressure -- seen by the wide stitching in the front of the shorts.

The Assos cS.Uno Skinsuit - Men's is available in six sizes from Small to TIR and in the colors Black and White.

Tech Specs

[upper panels] A.Plethon, [paneling] Type A430
yes, FI.Uno_S5
Removable Chamois:
Leg Gripper:
1 radio/media, 1 small zippered
Recommended Use:
time trial, triathlon
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.

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Avg. ride time: 5h 43m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Awesome skinsuit

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

First time wearing a skinsuit and very pleased with the fit. Great time on my time trial. I've bought assos in the past and quality is top of the line. XL fits perfect. Great pad. Bought mine at an excellent price on sale which made my purchase even better. Highly recommend this skinsuit.


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

This is my first Assos product and I am very impressed. It comes in a nice white box wrapped in tissue paper and right away you can tell it's a quality made product. And it's not made in China😀.
This is my third skinsuit. I used the sizing chart given and ordered an XL. I'm 6'1, 185lbs with a 43" chest so an XL should be spot on but it wasn't. I had gotten use to the real tight and snug fitting Castelli Bodypaint skinsuit and I found this size lacking that feeling. I downsized to a large. Now we're talking. Much better. Still not as quite the contortion event of putting the Castelli on but better.
Overall a very nice skinsuit, chamois is a little thicker than I prefer. Pockets are a nice addition. Materials, stitching, and construction all look really good. I would recommend it anyone looking for a skinsuit.

Unanswered Question

I am 5-8, 140 lbs. What size do you suggest? Thanks


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

5' 11", 150 pounds, wanted to buy my first "real" skinsuit. Caught a sale and this one looked to be a good quality.

I have a L in this. I thought I was between sizes, and I am by a smidge, but the L is good. I'd say it's good for me height wise, but it could actually be tighter over the body, I do have some light bunching around my hips when I'm tucked. Not causing me any issues just noting.

Definitely not something you will be wearing around the parking lot trying to look cool either, it naturally pulls your shoulders forward and isn't comfy if you try to stand up straight. It's made for being on a TT bike in a tuck.

Pad feels comfy for me, haven't ridden it more than about an hour.

I have the black color, and it is in fact quite warm on your back if you're out on an open road suffering.

Awesome racing cycling suit!

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

Let me first start by stating that I own 5 cycling bib shorts (4 from Assos and 1 from Q36.5) and the Chronosuit tops then all! Out of all bib shorts that I own this one may take the most time to fit into, but once you get past that, you'll forget about it during your ride. To reduce chaffing and skin irritation, I highly recommend Above Category’s Chamois Crème vs. Assos’ Chamois Crème. No cooling feeling (from menthol) in the private area from Above Category’s version. Above Category’s Chamois Crème rates in at a “0” on EWG (Environmental Working Group’s) rating system, while the Assos version scores a “5”.

On the bike trail the Chronosuit performed admirably. Splits on my favorite 0.5 mile bike loop used to take 1:50 to 2:00 with a bib shorts and short sleeve jersey combo, but they now take only 1:40 to 1:50 with the Chronosuit (I even logged a 1:36 lap – my fastest yet). A reason for the improvement in my splits is due to the reduction in drag that the Chronosuit offers by streamlining the torso and upper legs into one piece. The equivalent bib short and short sleeve jersey simply cannot offer this. Assos also claims that the long sleeves prevent drag against hairy arms.

Like KC stated in his review, the Chronosuit fits tightly, but pay close attention to the height measurement in Competitive Cyclist’s sizing chartss. I am 5’10” and I had to go up one size to a large to get a perfect fit (Competitive Cyclist’s size charts recommend ordering a size medium if you’re 5’10”).

The chronosuit uses an Assos Uno_s5 chamois. Best thing about the chamois is that it is barely noticeable during long bike rides.

I’ve only worn the Chronosuit once and did not get hot at all during my 100 minute bike ride (temperature was about 72 deg F). I’ll update this section as I log more rides in the Chronosuit in hotter conditions.

I've searched many cycling websites (Colorado Cyclist, Tour Cycling, Assos Factory Outlet, Bike Bling, etc) but Competitive Cyclist offers the Chronosuit at the cheapest price point ($319.95).

Nice job, Assos on an awesome cycling suit!

P.S. I liked the white version so much that I bought the black version in size large for additional rides during the week.

Fast and luxurious

  • Familiarity: I've put it through the wringer

Assos products are hit-or-miss for me, but they sure nailed this one. This chronosuit may be the best product they make. Fabulous quality fabrics are tailored into a design that only fits properly when on the bike. No loose fabric down the front to catch the wind! It has long sleeves, which if you've kept up with the latest wind tunnel research into arm hair, means that unless you're planning to shave your arms (no thanks) this will give a significant advantage. Due to the fabric I don't feel that the long sleeves are making me feel hot on a warm day, at least if they are it's so much less than the TT helmet that it doesn't matter. There are little elastic loops on the ends of the sleeves that go over your middle fingers to hold the sleeves in place, which is a nice touch.

The chamois I just don't notice while riding, which I think is the best thing you can say about a chamois.

Pay close attention to the sizing guide; this thing fits quite tightly, but I assume most buyers of a TT skinsuit are not weekend warriors.

The two rear zippered pockets are just large enough to hold an iPhone 6 (non-Plus) -- I had a Hincapie suit and it only had an internal radio pocket, so you had to unzip and perform some contortions to take out your phone on a training ride.

The best part is probably the price; while it's not cheap it's actually less expensive than a combo of a typical Assos jersey and bib shorts. Assos doesn't make TT gloves but the suit pairs well (performance and visual) with the Capo Crono Lycra SF gloves.