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Savile Blue

Castelli Nano Flex 3G Kneewarmer

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Nano Flex 3G KneeWarmer

For the flexibility to add and remove an extra layer on those chilly spring and fall rides, the Nano Flex 3G KneeWarmers are supremely versatile. Unlike wearing full-length tights or leg warmers, you're covered where it matters most. Your joints.

Proprietary to Castelli, the Nano Flex technology is a water-protective finish paired with their tried and true Thermoflex fabric, offering you the best coverage in all-conditions.


  • All condition kneewarmers
  • Water repellant Nano Flex technology keeps you dry and warm
  • Single, flat-lock seam ensures maximum comfort
  • Gripper is made of double-sided silicone keeping the warmers in place
  • Easy on/off and stowable in a jersey pocket
  • Castelli recommends these warmers for temperatures ranging from 54 - 68° F

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.


Black - Small

Mfg PartNum: Q19578010-2 

Black - Medium

Mfg PartNum: Q19578010-3 

Black - Large

Mfg PartNum: Q19578010-4 

Black - X-Large

Mfg PartNum: Q19578010-5 

Savile Blue - Small

Mfg PartNum: Q19578414-2 

Savile Blue - Medium

Mfg PartNum: Q19578414-3 

Savile Blue - Large

Mfg PartNum: Q19578414-4 

Savile Blue - X-Large

Mfg PartNum: Q19578414-5 

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Reviewed 1/11/2021
by Anonymous
Cycling Enthusiast
San Luis Obispo CA
Value Rating
Overall Rating
Extended length and silicone grippers on both sides to ensure they stay put.

I wear these with standard bib shorts and the extra coverage on colder days is great for staying warm. The tops have grippers on the inside next to your skin and outside next to the shorts so they stay put.

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Reviewed 4/25/2020
by Anonymous
Daily Commuter
washington state
Value Rating
Overall Rating
0 of 1 customers found this review helpful.
good fit and finish

replaced my pearl Izumi knee warmers with these and have been very pleased with how well they perform

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*Orders received before 3:00PM Pacific time are shipped the same day (Mon-Sat). Orders over $50 are shipped free (USA only, excluding AK and HI). Some exceptions apply. See Shipping for details. 26