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Assos LS.skinFoil_Winter Base Layer

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Item # AAS0216

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Item # AAS0216


As with the other six base layers in Assos' new skinFoil line, the LS.skinFoil_Winter Base Layer has abandoned the pricey, multiple pre-shaped panels of the past. Instead, the Swiss apparel guru went the route of a less expensive, less restrictive, and more comfortable tubular construction. What this really means is that with the new skinFoil yarns, the LS.skinFoil_Winter Base Layer ensures that you'll remain comfortable and dry this winter season.

Assos' new skinFoil yarns are integral to the functionality of the LS.skinFoil_Winter base layer. This material is a proprietary blend of polypropylene and polyester. Polypropylene and polyester are both polymers, meaning that they're both essentially plastics. However, where they differ is that polypropylene is hydrophobic to the point that it's unable to absorb water. And, as a result, it spreads moisture out over a larger surface area, which rapidly accelerates evaporation. So, in short, these fibers ensure that your torso and arms will remain dry. And when combined, the two fibers provide you with the ideal interface for interaction with either your jersey or jacket.

Additionally, this yarn blend forms a highly-elastic material that creates a push-pull effect in order to hold your muscles in place as you ride. The fabric is also antistatic and antibacterial, and it's also been dermatologically tested and approved. This means that you'll remain comfortable, fresh, and, most importantly, dry underneath all of your outer layers.

For this new collection of base layers, Assos decided to forgo any pre-shaped paneling designs in favor of a seamless, tubular construction. The reasoning behind this is that you receive a pleasing, non-restrictive level of fit. The fabric matrix is also spun, much like a sock, versus the standard flatbed knit technology. And compared to even a flatlock construction, this tubular method better wraps and supports your torso. However, just because skinFoil has abandoned Assos' hallmark of multi-panel patterns, it doesn't mean that it's abandoned Assos' AEPD ideology. In fact, you'll find that Assos has expanded on this through the incorporation of "bodyMap." Essentially, this takes the next-to-skin riding position of AEPD (advanced ergonomic pattern design) and increases its freedom of movement and low volume by varying the material thickness, structure, and elasticity around the body. This way, Assos guarantees a purposeful fit that feels nearly custom to your body.

The Assos LS.skinFoil_Winter Base Layer is available in the color Black and in the sizes 0 (XX-Small/X-Small), I (Small/Medium), II (Large/X-Large), and III (XX-Large/TIR). If you're familiar with Assos' ALS Climarange, this base layer falls into Winter 6. However, if you're not fluent in Assos, it means that it's appropriate for temperatures ranging from around 20 to 35 degrees Fahrenheit.

Tech Specs

74% polyamide, 23% polypropylene, 3% elastane
Insulation Weight:
Recommended Use:
cold weather road cycling and racing
Manufacturer Warranty:
limited lifetime

Size chart


Men's Apparel
Leg & Knee Warmers 0 I II
Height 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 Warmers 0 I II
Chest 35.4in
46.5+ in
How to Measure:
For best results, take measurements over your underwear.
Measure around the widest part of your chest.

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  • Familiarity: I've used it several times

I got the size III, I'm 204lbs, 5'10. 46 inch chest and broad shoulders (so the wife tells me). Fits like a glove, looks really nice and keeps me warm. I throw on a wind vest on days in the 30's. Anything above 40 degrees I would wear just this and MAYBE a base layer.


  • Familiarity: I've used it several times

I love Assos gear and have enough of it around that I don't wear anything else. I have never had a new Assos item I did not like until now. I love the old base layers, and I was super excited to see how they could improve the base layer, but they didn't. It fits awkward and bunches up behind the neck. When you downsize it is too constrictive. If I could give it no stars I would. This base layer is awkward, bulky, and not a good foundation for your other layers. It provides too much insulation and makes it easy to over heart. I wish they would go back to the old stuff!

Avg. ride time: 24h 26m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Best piece of cycling apparel that I own

  • Familiarity: I've put it through the wringer

I have used this daily for the last five weeks in temperatures ranging from 20F to 40F. I have altered the outer jacket but I always wear this as my base layer. This is simply an INCREDIBLE garment. It keeps me warm, fits like a glove, is relatively thin, lets me get rid of heat on uphills, and seems to be incredibly well constructed.

Update: I have been using this all through a beastly winter in temperatures from 10F to 40F. The fit is perfect. Yes, it is snug but no it does not bunch up or feel tight when riding. Given its thickness it is amazing what it accomplishes.

I am 6'1" and 195 pounds and wear an XL (also known as II) in this garment (and other Assos garments).

Hi,I'm would like to buy but for a 42in...

Hi,I'm would like to buy but for a 42in chest is it a Black II or Black I.

Best Answer

looks like your a II (large/xlarge) per assos web page and from above (your 107cm). I don't have this awesome piece but I know I've gotten wrong sizes from CC before and its an easy return process.

I would also suggest large/xlarge (II). I am a 97 cm chest and tried both the I and II on and ultimately decided for the II. It is a beautiful product and by far the nicest base layer I have ever worn (vs castelli, capo etc). The fabric stretches a lot and it was a trade off between extremely tight but not constricting in the I vs a little more relaxed (not pulled) with the II. Both fit well under a race fit jersey and the II will allow me to layer base layers in the Canadian fall/winter. Only draw back for me is the arms in the II are perhaps disproportionally longer ... or my arms are short :).... I will probably add the 5/7 in S/M (I). I wish Assos would add a black option to the 4/7.