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Castelli Thermoflex 2 Kneewarmer Black
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Castelli Thermoflex 2 Kneewarmer

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Mfg PartNum:
(3 customer reviews)
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MSRP: $49.99
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Castelli's Thermoflex 2 Kneewarmers provide luxurious fleecy warmth on dry and chilly bike rides in spring, fall and winter.

If you don't need the extra wet weather protection of Castelli's Nano Flex fabric, you'll find that the Thermoflex warmers outpace traditional warmers with a combination of the softest, most comfortable fabrics and the brand's careful attention to construction details.

The single-piece design means the Thermoflex 2 Kneewarmers won't rub or scratch while the dual-sided silicone grippers prevent slippage and keep them locked in place.

Features & Specs:

  • Thermoflex fleece fabric is warm, stretchy and soft
  • Single-piece construction with flat-lock seams
  • Embossed Castelli wordmark logos
  • Dual-sided silicone gripper elastic at top prevents sliding down
  • 12-20 degrees Celsius / 54-68 Fahrenheit
  • Weight: 84 g

B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.

Size Chart



Black - Small

Mfg PartNum: Q19532010-2 

Black - Medium

Mfg PartNum: Q19532010-3 

Black - Large

Mfg PartNum: Q19532010-4 

Black - X-Large

Mfg PartNum: Q19532010-5 


Ordered by Most Relevant First
5 stars
4 stars
3 stars
2 stars
1 stars
They won't stay up
by Anonymous

I own other knee warmers and I use them a lot including other castelli's. I know the tricks of keeping them in place. After two sets of these in two different sizes

(after conversations with you) these just will not stay up- I suspect it's the lining as I don't have this problem with other brands or sizing.

Reviewed 4/6/2023
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Very Comfy
by Chirard
Cycling Enthusiast
1 of 1 customers found this review helpful.

I've completed only one day with these and I'm glad I got them. It was a few degrees under Castelli's recommended 54 degree minimum and my legs felt fine (there wasn't much wind though). They seem a bit warmer than other pairs I have. They gripped pretty well, although I did have to pull them up once during the 3-mile ride. The soft material and flat seams make them very comfy.

Reviewed 2/1/2022
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Don't like them
by Anonymous
Cycling Enthusiast
SE New Mexico
2 of 2 customers found this review helpful.

Use on cooler mornings. Even though they fit tight, leg movement cause them to work down below knee. so after two uses, they went into the rag bag.

Reviewed 11/7/2022
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