Castelli Nano Flex 3G arm warmers review

A 'goldilocks' performer in my testing, the Nano Flex 3G arm warmers are high performers in every regard

Castelli Nano Flex 3G arm warmers
(Image: © Josh Croxton)

Cyclingnews Verdict

Others have a more premium feel, but the functional performance of Castelli Nano Flex 3G arm warmers make them some of the best

Pros

  • +

    Wind and water protection is among the best

  • +

    Great balance between warmth and breathability

  • +

    Inner and outer silicone gripper equals double-secure hold

Cons

  • -

    They are more expensive than the main competitor, which also happens to be better

  • -

    Slight overcompression of upper arm

You can trust Cyclingnews Our experts spend countless hours testing cycling tech and will always share honest, unbiased advice to help you choose. Find out more about how we test.

The Castelli Nano Flex 3G Arm Warmers are one of a host of accessories made by the Italian brand and put simply, they take Castelli's fleece-lined, water-resistant Nano Flex 3G material and shape them into cylindrical tubes of arm-warming goodness. 

When it comes to cold-weather cycling clothing, few brands are more established than Castelli. Join any local club ride anywhere in the world and you can bet the brand's iconic scorpion logo will be along for the ride. The brand is popular, and for good reason; it makes great quality cycling clothing that is a regular feature in our buyer's guides. 

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