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Castelli Nano Flex 3G Armwarmer


The Castelli Nano Flex 3G Arm Warmers are a stalwart of your winter cycling kit rain repellent, windproof, warming and luxuriously comfortable, this latest evolution of the Nano Flex technology is Castellis best yet.

The Nano Flex 3G fabric used across these arm warmers utilises a combination of newly updated durable water repellent (DWR) treatment and mechanical heat treatment to give previously unheard-of levels of rain protection. Light rain beads off the fabric, keeping you dry when those inevitable rainy spells descend.

On the inside of the Nano Flex 3G fabric, a super soft finish and the optimal loft have been achieved through Castellis meticulous research and development. The fabric feels phenomenally comfortable against the skin and the loft traps just the right amount of air above the skin to keep your heat regulated over a wide range of autumn and winter conditions.

This latest update to the Nano Flex fabric not only reflects Castellis ongoing commitment to offering you the very best garment quality but crucially means more time enjoying yourself on the bike.

The flat-lock stitching and single-seam construction keep the profile of the warmers low and the stretch is optimised for maximal freedom of movement. A dual-sided silicone gripper at the upper end secures the warmers in place. The compact size of the warmers makes them easy to stuff into rear pockets when conditions lighten up.

Key Features
  • Newly updated Nano Flex 3G fabric for exceptional warmth, softness and protection from the rain
  • Minimal seam construction for aesthetic versatility and freedom of movement
  • Easily packable into a pocket
  • Highly breathable
  • Optimal temperature range is 8C 20C
  • Nano
  • Road
Cycling Clothing Fit:
  • Regular Fit
  • 16°C to 20°C
  • AW22
  • Castelli

How long will it take to arrive?

Please check the stock availability notice on your item when placing your order. This item is:

How will I know it has been sent?

You will receive an email to confirm when your item has been sent.

You can also check the status of your order and individual items by accessing My Account details and following the prompts.

Please allow 10 working days from dispatch of your order before notifying us of any late deliveries.

It may be advisable to check with your neighbours to see if a parcel has been left with them, check any outhouses you might have where it may be left if it cannot fit through your letterbox and contact your local sorting office to see if the item has been returned to the depot as undelivered and awaiting collection.

If I'm not completely happy with my item?

Please see our returns policy.

Customer Reviews

Overall Rating : 4.5 / 5 (4 Reviews)
  • 2 5 star reviews
  • 2 4 star reviews
  • 0 3 star reviews
  • 0 2 star reviews
  • 0 1 star reviews

Top Customer Reviews

Where reviews refer to foods or cosmetic products, results may vary from person to person. Customer reviews are independent and do not represent the views of The Hut Group.

Top item

Paired with Perfetto alpha light or Gabba it makes ideal kit for cool days with wind and showers. Great item. Typical top service from ProBikeKit.

Arm warmers

They do exactly what the say they do. Keep the cold wind off my arms. Slightly thicker than others and do not stretch as well as others, but grab yourself the correct size and that is not a problem. Sixing is correct.

Arm warmers

Very good product, kept me dry and warm when caught in a rainy windy ride. Could possibly breathe a little better, but that might compromise the water proofing barrier. Very happy with the product.


I purchased a small size as my arms are quite thin but these are still extremely snug. The material is awesome and very water proof. I ran them under a tap to test them and water just beaded off them and left them bone dry. The advert reads that these are not waterproof but I can tell you that they are!. Look and feel is amazing and great value for money. I have also purchased the nano flex 2 bib tights which are just the same. Winter and rain is no longer an issue. Delivery was super fast. Will definitely purchase from pro bike kit again.