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Thermoflex 2 Knee Warmer

1 out of 5 stars
1 Review


Size Chart


Thermoflex 2 Knee Warmer

Throw on your favorite bib shorts and grab a set of the Castelli Thermoflex 2 Knee Warmers and enjoy a bit of extra protection from the cold when you're cycling in the shoulder seasons. The Thermoflex fleece fabric is warm, stretchy, and soft, and is constructed using flat-lock seams in order to alleviate any irritation or discomfort.


  • Protect your knees on chilly rides with these soft warmers
  • Thermoflex fleece provides warmth and next-to-skin comfort
  • One-piece design with flat-lock seams prevents irritation
  • Elastic cuff with gripper keeps them from sliding down
  • Item #CST00UL
Thermoflex fleece
Claimed Weight
[pair] 3oz (84g)
Manufacturer Warranty
1 year

Overall Rating

1 based on 1 ratings

Review Summary

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

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1 out of 5 stars

December 8, 2020

Huge disappointment!

I've used it once or twice and have initial impressions
Size Bought:
5' 9"

First the sizing is all wrong; 1st I ordered L based on the sizing chart... Exchanged for M and they're still too big. Now the seam at the top where the thermal material meets the rubber material use to hold the warmer in place has come apart. Castelli use to be a premium brand; what happened? Now they're too old to return(just over a month old, worn one time) even tho they're defective... I guess i will need to call the manufacture for a replacement.