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Castelli Thermoflex Knee Warmers


Item # CST00GO

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  • Black, S ($39.95)
  • Black, M ($39.95)
  • Black, L ($39.95)
  • Black, XL ($39.95)
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Item # CST00GO

Happy knees, good ride.

The small tendons, ligaments, and muscles around your knees play an integral role in your ride quality, so don't leave them cold and exposed when you're riding in unpredictable shoulder season weather. A light breeze in your driveway turns brisk in a hurry when you drop into a long descent, so cover your 'caps with the Castelli Thermoflex Knee Warmers to help ward off stiffness after hours on the roads. These stretchy fleece warmers insulate but remain breathable when you break a sweat, making them ideal for the changing temps during spring and fall.

  • Protect your knees in cool weather without overheating
  • Form-fitting cut with gripper elastic prevents slippage
  • Thermoflex fleece wicks moisture while it insulates
  • Cross-wrap cuff at the bottom for a comfortable fit

Tech Specs

Thermoflex fleece
Claimed Weight:
[pair] 94g
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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Perfect for when its warm-ish

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

Knee warmers are seemingly arbitrary, which I have thought for many years. Why not just wear full legs? Why not wear just shorts? But after living through a spring in Utah, these bad boys are a necessity for when you start a ride at 7am and its snowing but the forecast later shows sunny and 65. Riding in the mountains is always a mystery when getting dressed.

On a technical note: these do a great job of staying up on my leg, they are long enough to cover the necessary areas on my long legs and have great silicone grippers that grip both sides so it stays on my leg and my bib shorts. I am 5'11'' and 148lbs, long legs and skinny and I have a small.