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Castelli Nano Flex 3G Legwarmer Savlie Blue
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Nano Flex 3G Legwarmer

Mfg PartNum:
  (4 customer reviews)
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MSRP $69.99
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Nano Flex 3G Leg Warmer

For the flexibility to add and remove an extra layer on those chilly spring and fall rides, adding a good pair of leg warmers is essential. Unlike wearing full-length tights, you have the option to slip off your leg warmers mid-ride and stow them in your pocket when your temperature needs adjusting.

As light rain comes down and you need protection from road spray, the Nano Flex 3G Leg Warmers have you covered without allowing moisture to soak through. When the skies are clear but the conditions are brisk, these leg warmers are highly breathable and lightweight enough for riding temps ranging from 54 - 68° F.


  • Rain or shine, these leg warmers are highly versatile and breathable
  • Water repellant NanoFlex technology keeps you dry and warm
  • More breathability to prevent overheating
  • 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.

Castelli Nano Flex 3G Legwarmer
Other styles of this product are available.

Black - Small

Mfg PartNum: O19577010-2 

Black - Medium

Mfg PartNum: O19577010-3 

Black - Large

Mfg PartNum: O19577010-4 

Black - X-Large

Mfg PartNum: O19577010-5 

Savlie Blue - Small

Mfg PartNum: O19577414-2 

Savlie Blue - Medium

Mfg PartNum: O19577414-3 

Savlie Blue - Large

Mfg PartNum: O19577414-4 

Savlie Blue - X-Large

Mfg PartNum: O19577414-5 

Ordered by Most Relevant First
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WAY too short. What happened to consistency in sizing, Castelli???
by Gary
Cycling Enthusiast
Portland, Oregon

This was my third pair of Castelli leg warmers, and my second pair of Nano Flex. A size large fit perfectly the first two times. But when I received this latest pair, they were four or five inches too short. Same product, same size, but a vastly different fit. What's up, Castelli? Whatever happened to consistency in sizing? Fortunately, the kind folks at Western Bike Works took them back without question. Time to find a different brand.

Reviewed 2/28/2022
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by Anonymous

Used to love these, and had two previous versions. The 3g ones are much shorter with large ankle openings. No go for me.

Reviewed 11/20/2022
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Great fitting leg warmers with seems on that run on the sides of your knees.
by Anklebiter
Competitive Racer
Eugene, Oregon

Riding in temps below 50 degrees. They shed light rain and try quickly. They have changed the design with the same fleece used throughout the leg warmer. In the past they had a lighter material that allowed for more freedom of movement.

Reviewed 3/28/2022
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by Anonymous
2 of 2 customers found this review helpful.

Castelli tends to run small, I sized up and fit was good, zipper at ankle was nice and seemed durable. Keep me warm in 50 degrees farenheit range.

Reviewed 1/10/2020
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