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CastelliNano Flex 3G Leg Warmer


Item # CST00UI

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Item # CST00UI

Nano Flex 3G Leg Warmer

A good pair of leg warmers will give you that extra bit of warmth you need to stay comfortable on chilly spring and fall rides, but unlike full-length tights, you can easily slip them off and stow them in a jersey pocket when cold mornings transition into mild afternoons. These particular warmers use a water-repellent fabric that prevents light rain and road spray from soaking through, but are also highly breathable, making them a great option for dry days too.

  • Rain or shine, wet or dry, these warmers will do the trick
  • Water-repellent fabric keeps you warm and dry during your ride
  • Breathable construction prevents clamminess and overheating
  • Single, flat-lock seam ensures maximum comfort
  • Double-sided silicone gripper keeps the warmers in place
  • Easy to take off and stow in a jersey pocket if things warm up
  • Recommended for temperatures ranging from 54 - 68-degrees Fahrenheit

Tech Specs
MaterialNano Flex 3G
Recommended Useroad cycling
Manufacturer Warranty1 year


Arm & Knee Warmers





Rider Weight

99.2 - 132.3lb

(45 - 60kg)

99.2 - 132.3lb

(45 - 60kg)

132.3 - 154.3lb

(60 - 70kg)

154.3 - 176.4lb

(70 - 80kg)



Short/Jersey Size XS - S S - M S - M L - XL 2XL - 3XL
Short/Jersey Size:
Take your typical cycling short or bib sizing for comparison.

What do you think about this product?


>Rating: 5

Warm and comfortable

I've used it several times
True to size
Size Bought
5` 11"
162 lbs

Normally, I am only motivated to write reviews of merchandise that I truly love or hate. That's the case here. I love these for their comfort, fit, quality, and warmth. Additionally, as with any cycling cold-weather gear, it is important to be able to peel it off and stow it as the day warms up. In this part of the country, we ride the entire year. In spring, fall and winter we are almost always COLD at the start and often HOT at the end of the ride. That's why these are a more practical purchase than insulated knickers or insulated tights -for me anyway. Others have complained about the zipper rubbing a sore spot on their ankle. I have never had that problem.

>Rating: 5

Deserves their reputation...

I've put it through the wringer
True to size

Castelli gear isn't cheap. But I've tried a lot of leg warmers over the years and none do the job as well as the Castelli Nano Flex 3G. I have three pairs (rotation) and they're my "go to" accessory for mid-Fall to late-Spring. Sure, if serious winter temps arrive, they may not be enough, but last year nano-flex warmers got a workout Nov-Mar. And I especially appreciate how well they stay up too. Entering my second full season with them...


Stupid question, how do you know which one is the left or the right? Does it matter?

>Rating: 5


I've put it through the wringer
True to size

I bought these and have used them a dozen times. The fit is excellent and they provide really good warmth. Wonderful product!