Free 2-Day Shipping on Orders Over $50
Save an Extra 10% on Select Components
  • Castelli Sanremo 2 Thermosuit - Men's
  • Castelli Sanremo 2 Thermosuit - Men's Back
  • OptionsCastelli -
  • Detail Images - Back
CastelliSanremo 2 Thermosuit - Men's
Sale 25% Off$262.46 $349.95

Item # CST00D6

Select options
  • Cancel
  • Select options
  • Orange/Black, M ($262.46)
  • Orange/Black, L ($262.46)
  • 100% Guaranteed Returns
  • Free 2-Day Shipping
    on orders over $50

Item # CST00D6

The last word in cold-weather cycling.

When gearing up for cold-weather cycling, we typically accept that things like fit comfort and aerodynamics will be sacrificed in favor of wind-stopping power and warmth. Leave it to Castelli to refuse this sacrifice with the Sanremo 2 Men's Thermosuit, a piece of kit designed to offer the aerodynamic benefits of a bulk-free fit without the restriction of bibs—all while preserving the benefits you'd expect from the company's flagship cold-weather technology.

The Sanremo 2 uses a mix of fabric panels in strategic locations to create a microclimate in the sliver of space between your skin and the Thermosuit. The Windstopper X-Lite fabric leads the charge on the upper portion, offering 1.4 billion impossibly small pores per square inch that guard your microclimate jealously. They don't let wind in, but they do 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 considered truly "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 guaranteed a literally windproof top.

The bottom portion is a mix of Thermoflex and Thermoflex Core2, using the former for areas that need more stretch and the latter in areas that need more protection. Both iterations of Thermoflex use hollow-core yarn to increase the size and insulating power of that thin microclimate. The whole Thermosuit is water-resistant and lined with a brushed interior so it's comfortable against your skin without any need of a mediating base layer.

The fit is the same bulk-free, race-worthy fit you'd enjoy wearing Castelli's Gabba Long-Sleeve Jersey and Sorpasso Bib Tights, less two elements: The bibs and the gaps. We often find that bibs are unduly constrictive on cold-weather bottoms because of their focus on insulation rather than flexibility, so doing away with them is a plus, and the fact that the Sanremo 2 is a suit means that there are no unfortunate gaps in coverage at the waist. The sleeves are forward-oriented, so the Thermosuit feels a little tight across the chest while you're standing, but it relaxes into a comfortable fit while you're stretched out on your bike. Add to this the Progetto X2 Air chamois, and you've got what may amount to the most comfortable cold-weather cycling outfit to date. You may actually regret going back to your summer kit.

A few thoughtful details round out the Sanremo 2: the underarms offer increased ventilation, the collar is articulated to eliminate looseness in the saddle, there are three rear pockets in the top, the front zipper overlaps, the ankle zippers tighten down for a secure fit, and both the top and bottom have reflective tape to increase your visibility to motorists in low-light conditions.

The recommended low-end thermometer rating for the Sanremo 2 has dropped four degrees Fahrenheit compared to its predecessor, from 41 to 37, while the top end remains at a generous 59. We say generous, because we feel that the Sanremo 2 starts getting too toasty for conditions above 55 degrees and sunny.

  • An insulated bodysuit for cold-weather cycling
  • Windstopper membrane blocks the winter weather
  • Lightly brushed lining insulates and breathes
  • Construction eliminates gaps between jersey and tights
  • Slim fit mimics summer-weight racing kit
  • Reflective details boost visibility in low-light conditions
  • Recommended for use into the mid-30s
Tech SpecsSize
Tech Specs
[top] Gore Windstopper X-Lite, [bottom] Thermoflex, Thermoflex Core2
yes, Progetto X2 Air
3 rear
Recommended Use
Manufacturer Warranty
1 year


Men's Apparel
Chest 36.2in
Waist 31.5in
Hip 37in
Inseam 31.9in
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.

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

Built for Rode Snakes

  • Fit: Runs small
  • Size Bought: XL

Love it so much I bought two. Built for Rode Snakes like me as it runs thin and lean. I'm 6'2", 170lb and xl fits perfect. Great for high 30s-low 50s. Super aero.

Unique piece of kit

  • Familiarity: I've used it several times
  • Fit: Runs small

I bought this on Clearance with an additional Sale price on top of that so for $160.00 I'd say it's ok for the price, anything more than that and I would of returned it. From a style perspective it's really cool. From a functionality/ performance I'm not entirely sold. I wish Castelli would of gone away from the zippered legs , the zipper rides up and doesn't stay put, plus there's not benefit to them. The suit does run small and is somewhat difficult to get out of after your ride due to it's construction. This is Not my go to piece of winter gear partially because it's not warm enough on days I would wear it unless you layer.

Made for midgets

  • Fit: Runs small
  • Size Bought: xxxl

Excellent quality, great design, if you have tiny ankles and skinny legs.
6'1 240 lbs XXXL is too tight, tailored small from top to bottom.

Avg. ride time: 6h 49m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.


  • Familiarity: I've used it several times
  • Fit: Runs small

This is now my new go to winter tights. I rode down to 20F with a base layer and jacket. Good alone for high 40s to low 50s. You need to size up. I'm 5' 10, 202lbs. A bit expensive but worth it. When you first put them on they feel tight, but once into a biking position (over the bar) they feel great. I'd buy them again.

I'm about the same size (5'9"/200-ish). What size did you get? I'm debating between XL and XXL.

Avg. ride time: 8h 13m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Great Bit of Winter Kit

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

This is the most comfortable winter kit I've ever worn, although it's not the warmest. I find that I'm comfortable in this kit from ~40°F up to ~50°F. Castelli rates the kit from 41-59°F, but I find I get too warm above ~50°F. In the 30s I need a base layer. Below that I'll add a jacket, a balaclava, and some ski socks. As with most of Castelli's more race-cut stuff, the sizing seems a tad small. At 6' 0, 185 lbs, the XL fits me perfectly.

Avg. ride time: 5h 18m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Great one piece for winter

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

With a good base layer I've managed to stay comfortable down to -5 Celsius in rain, snow, and wind.

Only two minor complaints:
The pockets are small. I feel like an extra pocket or two inside the jacket would make it perfect.

The ankles portion is really small. Don't know who tested it, but I feel like they have the smallest ankles in the world. I can still manage to close it shut all the way, but it's definitely a tight squeeze.

Even with those two minor complaints I would buy it again but only if it was on sale.