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Flanders Warm Long-Sleeve Baselayer - Men's

4.333333333333333 out of 5 stars
6 Reviews
Current price: $82.49 Original price: $109.99
25% off


Size Chart


Flanders Warm Long-Sleeve Baselayer

Nothing ruins a ride faster than catching a chill. Except maybe a flat tire. Or slushy conditions. Well OK, there are lots of things that rival catching a chill, but we still don't like it. So as the seasons change, we start thinking along the lines of layers, and this inevitably leads us to the Castelli Flanders Warm Base Layer.

The Flanders is made with a durable SottoZero Fleece that insulates and wicks. Dryer, after all, is warmer. Mesh inserts provide ventilation in the underarms, just in case you overheat, and the flatlock stitching and flat hems mean the Flanders will fit comfortably as a piece of layering gear. Castelli recommends it for use in 25 to 50 degrees Fahrenheit, and, while this range may seem excessive, we find that the Flanders gets the job done in all conditions when layered with the right outer layer.

The Castelli Flanders Warm Base Layer - Men's is available in six sizes ranging from X-Small to XX-Large in the color Grey.


  • Midweight base layer designed for winter cycling
  • Multi-denier wicks effectively so you stay dry
  • High-loft fleece lining provides warmth to spare
  • Mesh armpits help prevent overheating
  • Flat-lock stitching for an irritation-free fit
  • Flat hem comfortably tucks away into your tights
  • Recommended for 25 - 50-degrees Fahrenheit
  • Item #CST002W
SottoZero Fleece (100% polyester)
Insulation Weight
Claimed Weight
Manufacturer Warranty
1 year

Overall Rating

4 based on 5 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 0 reviews
3 Stars - 2 reviews
4 Stars - 0 reviews
5 Stars - 3 reviews

Fits Slightly Small

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

What do you think about this product?


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5 out of 5 stars

May 17, 2024

My Favorite Baselayer

I've used it several times
Size Bought:
5' 10"

I've been riding a lotta years, and have used many base layers over the duration. This is the best one. I like it so much I bought a second! I use it under a regular jersey on cool days. I also wear this running in the winter. Great fit, great breathability and look. Highly recommend!

birp806574 b
3 out of 5 stars

January 11, 2023

Too long

I returned this product before using it
Size Bought:
5' 8"

Not sure why someone would want something that goes so far down into bibshorts/tights but if you do, or you're really tall and thin, this might be good for you. Pretty nice but unusable for me so returned.

ew e38
3 out of 5 stars

December 29, 2020

Castelli cool weather

I've put it through the wringer
Size Bought:
5' 10"

This shirt is exceptionally well made. However, if you are more of a USA sized boy (like me) the Castelli sizes have gone crazy teeny tiny.... I ordered an XL and this is 5-6" shorter in the torso than a 10 year old Craft of similar use. It is a trend we all need to be aware of. Solid Castelli quality, but sizing is nowhere near what other brands are running. As a reference, CC had me purchase a 2XL long sleeve winter jersey and its PERFECT. ***I am 5'10" and weight 180-185 with a swimmer build as your reference

Kenneth H
5 out of 5 stars

November 20, 2020

glad I listened to the reviews

I've used it several times
Size Bought:
5' 9"

this thing is pretty nice. Went on a brisk ride and was surprised that while it kept me warm, also had some breath-ability in it. I would say it runs true to size, I'm 5'9" 165 athletic build 41" chest and this fit well. A little long in the arms but I also tried the XL and it was a little baggy

Sean E
5 out of 5 stars

November 4, 2020

Love it:

I've put it through the wringer
Size Bought:
5' 10"

Has been my go-to either above Assos base/skin layer or solo underneath Assos or Castelli jacket. Wicks great and adds the warmth and comfort I need in the 30s and low 40s. Not gonna lie, have also found myself wearing it as a casual base layer under a hoody in cooler weather - also perfect casual top above thin T-shirt.