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Castelli Thermoflex Knee Warmers


Item # CST007Z

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Item # CST007Z

Warm knees, fast rides.

Believe it or not, your knees can get cold, so Castelli designed the Thermoflex Knee Warmers to protect them when you're slicing through chilly conditions. The microfleece lining makes the Thermoflex the warmest knee sleeves that Castelli offers, and the upper silicone gripper keeps them from sliding down and cramping your pedaling style.

Tech Specs

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.

Reviews & Community


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Avg. ride time: 8h 45m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

does the job

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

These warmers ride up from the calf and get bunched right after the knee area. I have tried different sized but this always seems to happen with the thermoflex warmers. They work well in weather from 45-60

Unanswered Question

I bought a size that is too large and missed the return window. Could I put these in the drier and try to shrink them?

What I wanted

  • Familiarity: I've used it several times

These knee warmers are exactly what you'd expect. They are comfortable, well-fitting and warm, with nice fleece lining inside. They have decent grippers around the thigh which prevent them slipping and i think they are good value for money. They are lighter than the Nanoflex ones and not quite so tight-fitting, but they still keep my legs warm even in low single digit degrees - It will probably have to get nearer 0-celcius before i need to switch to full thermal bib tights.