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  • Castelli Sanremo 3 Thermosuit - Men's
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CastelliSanremo 3 Thermosuit - Men's
Sale 20% Off$279.97 $349.95

Item # CST00NB

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Item # CST00NB

Sanremo 3 Thermosuit

While protection during cold-weather cycling and aerodynamics are usually thought of as mutually exclusive, in which case we'd gladly sacrifice wind-stopping power and insulation to a bit of drag, leave it to the experts at Castelli to buck convention with its Sanremo 3 Thermosuit. After all, it was quite instrumental in bringing speedsuits to the pro peloton and its revolutionary Gabba jersey to the classics. We want to go fast all year long, so we can totally get behind a kit designed to slice through the wind with a streamlined fit, removing the constraints of bib straps, all while preserving the stalwart benefits achieved through the company's flagship cold-weather apparel.

The Sanremo 3 places fabric panels at strategic locations to create ideal climate zones across your body while in the cycling position. The Windstopper X-Lite plus and 150 fabric is the first layer of defense against the chill on the upper portion, offering up 1.4 billion impossibly small pores per square inch that keep body heat in and let moisture and water vapor out. This isn't just based on vague marketing copy, though; the science behind Windstopper X-Lite is measurable in a rating called CFM, which stands for cubic feet per minute, used to measure the volume of air that passes through a fabric in—you guessed it—one minute. In order to be deemed "windproof," a fabric must register a CFM of equal to or less than 1.0. The Windstopper X-Lite fabric actually beats this rating, so you're virtually guaranteed a windproof top.

The bottom portion is a mix of Thermoflex and Thermoflex Core2, using the former for areas that need more stretch, think the thighs and the back of the legs, and the latter in areas that need more protection like the front and knee area. Both versions of Thermoflex use hollow-core yarn to provide more insulating pockets of air as well as the ability to better wick away moisture. The whole Thermosuit is lined with a brushed fleece interior that sits softly against your skin.

The Sanremo construction provides the same bulk-free, race-worthy fit you'd enjoy while wearing Castelli's Perfetto jacket and Sorpasso Bib Tights, but in one package that eliminates the possibility of draft inducing gaps. Cold weather bibs are often unduly constrictive on cold-weather items because of their focus on insulation rather than flexibility, so doing away with them is a plus, and the fact that the Sanremo 3 is a suit means that there are no unfortunate gaps in coverage at the waist. The cut is optimized for an on the bike fit and its fit is forward-oriented, so the Thermosuit might feel a little tight across the chest while you're standing, but it relaxes into a comfortable fit while you're stretched to the bars on your bike. The icing on the cake is the Progetto X2 Air chamois providing comfort on the longest base mile rides and you've got what's arguably one of the most comfortable cold-weather cycling kits we've tried. We honestly have no regrets riding into the colder months with top notch gear like this.

The final details that round out the Sanremo 3 include a tall collar for extra warmth, three rear pockets to haul riding essentials, and YKK ankle zippers offering a secure fit and provide easy entry and exit from the garment with GIRO3 elastic and reflective zip covers to help increase your visibility to motorists in low-light conditions.

The recommended thermometer rating for the Sanremo 3 is between 39 and 57 degrees. Anything lower than that might necessitate a warmer base layer or an additional outer shell.

  • An insulated bodysuit for cold-weather cycling
  • Windstopper membrane shuts the door on winter weather
  • Lightly brushed lining insulates and wicks moisture
  • Sanremo construction eliminates gaps between jersey and tights
  • Its slim fit mimics an aero summer-weight racing kit
  • Reflective details boost visibility in low-light conditions
  • Recommended for use into the mid-30s
Tech SpecsSize
Tech Specs
[upper] Gore Windstopper X-Lite, [bottom] Thermoflex, Thermoflex Core2
winter, spring, fall
3 rear
Recommended Use
road cycling
Manufacturer Warranty
1 year


Men's Apparel




















































How to Measure:
For best results, take measurements over your underwear.
Measure under your arms, around the fullest part of your chest.
Measure around your natural waistline, keeping the tape a bit loose.
Measure around the fullest part of your body at the top of your legs.
Using pants that fit well, measure the crotch seam to the bottom of the leg.

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Avg. ride time: 2h 57m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Think it'll do the trick

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

Originally got the medium since I can often fit American size medium, but it was too tight in the upper body and especially across my little bit of a gut.

Moved up to a large and found that to be better -- although still a little peaking of my gut when not riding.

Most importantly, it covered me well and felt great on my ride. Did exactly what I expected. I did ride right at the upper extreme of the recommended temp, so it did get a little warm. But I simply unzipped a little and felt better.

And, the padding was nice. It felt like there may actually be more padding in the front, which was kind of nice as too much padding in the back often feels a bit too awkward for me.

There's not much I'd change. Although the black and red, which I prefer the look of could use some of the reflectivity that the orange one has (which is what I had purchased in the medium.

Avg. ride time: 27m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Great shoulder season kit!

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

Wore this the day I got it on a 1.5 hour easy pace ride. Started at 39F and maxed at 48F, overcast, winds 10-15mph. The top is not as well insulated as the bottom, I was pretty cold at first but was fine as the weather and I warmed up.

Wore at a 35 mile gravel event (Speedwagon, Polson, MT) with the Castelli LS Prosecco base layer. Race start was 35F, maxed at 42F, overcast with constant winds at 20-25mph. Having the base layer was just right. Probably would have been cold if I would have had to stop to change a flat with all the wind.

I bought the large in orange. Lots of comments on how visible it is. Fit is good. I normally ride around at ~180lbs, still carrying some winter beer weight. I think once I'm where I need to be, the fit will be great.

One note: If you aren't very flexible in your shoulders, the pockets ride a little high and tight. This is common with the San Remo line. I struggled getting gels out on sketchy gravel sections because I have shoulder issues. On road it is more manageable.

Comfortable & Warm

  • Familiarity: I've used it several times

I hate the waste bands on 2 piece suits and the shoulder straps on bibs so this is the perfect soultion. It is easy to put on with a zipper that fully opens. Snug but comfortable fit. Very warm without sweating and not bulky. I mostly wear it solo between 45 & 55 degrees. A base layer makes it comfortable down in the upper 30s. At 60 degrees it gets too warm. 6' 150# and a medium fits nicely.