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

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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. 

Josh Croxton
Associate Editor (Tech)

Josh is Associate Editor of Cyclingnews – leading our content on the best bikes, kit and the latest breaking tech stories from the pro peloton. He has been with us since the summer of 2019 and throughout that time he's covered everything from buyer's guides and deals to the latest tech news and reviews. 

On the bike, Josh has been riding and racing for over 15 years. He started out racing cross country in his teens back when 26-inch wheels and triple chainsets were still mainstream, but he found favour in road racing in his early 20s, racing at a local and national level for Somerset-based Team Tor 2000. These days he rides indoors for convenience and fitness, and outdoors for fun on road, gravel, 'cross and cross-country bikes, the latter usually with his two dogs in tow.