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Castelli Nano Flex 3G Armwarmer Black
Castelli Nano Flex 3G Armwarmer Savile Blue
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Castelli Nano Flex 3G Armwarmer 1
Castelli Nano Flex 3G Armwarmer 2

Castelli Nano Flex 3G Armwarmer


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Mfg PartNum:
$41.99-$59.99 pr
MSRP: $59.99
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Ride through the seasons, or changing conditions from morning to night, with Castelli's versatile Nano Flex 3G armwarmers.

Great when it's dry and chilly but also affording extra protection and warmth against wind gusts and fall drizzles, Nano Flex warmers are easy to put on, and just as easy to take off and pack away when the weather improves.

A decade in development, Nano Flex gave birth to the category of water-protective thermal fabrics, and Castelli's proprietary and game-changing invention is often imitated but never equaled.

In non-precipitating conditions, the proprietary third-generation material is stretchy, breathable and soft thanks to its fleeced inner face. Pedal into the elements, though, and the durable surface, which is enhanced with a chemical water-repellent finish, keeps moisture grounded in the no-fly zone.

For those times when you won't accept compromises under any conditions, choose Nano Flex 3G warmers.

Features & Specs:

  • Water-repellent thermal and breathable Nano Flex fabric
  • Flat-lock stitching with single seam
  • Double-sided silicone grippers to keep warmers in place
  • Claimed weight: 66 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: P19529010-2 

Black - Medium

Mfg PartNum: P19529010-3 

Black - Large

Mfg PartNum: P19529010-4 

Black - X-Large

Mfg PartNum: P19529010-5 

Savile Blue - Small

Mfg PartNum: P19529414-2 

Savile Blue - Medium

Mfg PartNum: P19529414-3 

Savile Blue - Large

Mfg PartNum: P19529414-4 

Savile Blue - X-Large

Mfg PartNum: P19529414-5 


Ordered by Most Relevant First
5 stars
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1 stars
Reviewed 6/7/2021
by cbratina
Cycling Enthusiast
Litchfield, Connecticut
Value Rating
Overall Rating
1 of 1 customers found this review helpful.
Great arm weather for cold, wet conditions.

Works great on cold days, and especially with a light rain where it keeps the arms pretty dry. Was a great combination with my Castelli Perfetto RoS Light Jersey while cycle touring with several chilly days with a drizzle and light rain.

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Reviewed 10/31/2021
by Defyguy
Overall Rating
1 of 1 customers found this review helpful.
Excellent product

I'm in love w these arm warmers. Can I marry them?!? Maybe I can get a marriage tax break!!

All fooling aside, I love these things. They are super warm and super comfy. They have excellent grip so I've never had a problem w them sliding down. Not even a little. I would definitely buy again if they ever wear out. Good luck on them doing so. Or buy as a gift. Make an amazing gift. I bought these With my own money for myself for cool MN rides in late fall. I seriously would not even look at another brand. Simply amazing!

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Reviewed 11/27/2021
by Anonymous
Cycling Enthusiast
Columbus OH
Overall Rating
1 of 1 customers found this review helpful.
So far quite good at a reasonable price

I've used these in damp weather (including with a short sleeved jersey under a winter jersey) into the high 30s; so far I've not used them alone in rain so I can't speak to the reputed water resistance. They fit well, stay up, and are warmer than others I've had-the fleece inside is great.

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Mechanic's Corner

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All about leg and arm coverings to keep you protected in inclement weather.
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