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Castelli Thermoflex Leg Warmers


Item # CST008A

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  • Select options
  • Black/Red, S ($49.95)
  • Black/Red, M ($49.95)
  • Black/Red, L ($49.95)
  • Black/Red, XL ($49.95)
  • White/Red, S ($49.95)
  • White/Red, M ($49.95)
  • White/Red, L ($49.95)
  • White/Red, XL ($49.95)
  • Black/Yellow Fluo, M ($49.95)
  • Black/Yellow Fluo, L ($49.95)
  • Black/Yellow Fluo, XL ($49.95)
  • Black/Drive Blue, S ($49.95)
  • Black/Drive Blue, M ($49.95)
  • Black/Drive Blue, L ($49.95)
  • Black/Drive Blue, XL ($49.95)
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Item # CST008A

Warm legs are strong legs.

Your legs are your engine, so Castelli designed the Thermoflex Leg Warmers to keep them toasty when you're hammering or warming up in chilly conditions. The microfleece lining makes the Thermoflex the warmest leg sleeves that Castelli offers, and the upper silicone gripper keeps them from sliding down and cramping your pedaling style. They even have low-profile ankle zippers, which lets you slide them on and off without breaking a sweat.

Tech Specs

[outer] 86% polyamide, 14% elastane
Recommended Use:
Manufacturer Warranty:
1 year

Size chart


Arm and Knee Warmers
Rider Weight 99.2 - 132.3lbs
(45 - 60kg)
132.3 - 154.3lbs
(60 - 70kg)
154.3 - 176.4lbs
(70 - 80kg)
Short Size XS - M S - M L - XL 2XL - 3XL
Short Size:
Take your typically cycling short or bib sizing for comparison.

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  • Fit: True to size

At $49.95 probably a 1000% markup. Regardless they could put some effort into the design. It's a tube of spandex. The only good warmers I've owned are Assos, though expensive at least I don't feel offended.

great product, loving it

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

I love this leg warmer, it is super comfortable and fits perfectly for me. I do have big thighs and I had go to with the large on this one. They are great for cold (but not too cold) and dry rides. It is not that effective on wet weather and super cold days, for that I recommend the Nanoflex warmers.

I am 5'9", 165 lbs, and 32 inch inseam - what size of the castelli thermoflex leg warmer should I wear?

You are going to be a M or L. Order both and send back the one that doesn't fit.

Would recommend

  • Familiarity: I've used it several times

These are great - I've previously had issues with leg warmers staying up but being too tight or falling down! These are perfect, they are warm enough (35 degrees), easy to get on and off (great zipped lower leg), look good and are well made.