Castelli NanoFlex Arm Warmer

Castelli Clothing



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An essential piece of Ride Wear - whether worn from the start of a ride, or pulled out of a rear jersey pocket when a little protection is required, cycling arm warmers are your best friend on the road, and the Castelli NanoFlex Arm Warmer is an excellent example.

Offering a wind resistant outer is pretty standard in the world of arm warmers, but for the NanoFlex, things get really interesting when it starts raining and its water repellent properties come into play. Whilst not full-on rain proof, they will repel showers, which on fast descents or long stretches far from home, can be a really handy feature. Smooth, stretchy and highly breathable, they are great in every ride condition. A silicon top gripper completes the warmer.

Product features
  • Water Resistant
  • Wind Resistant
  • Open Road
  • Water-resistant NanoFlex fabric
  • Warm, stretchy and breathable
  • Great in every possible ride condition
  • Silicon top gripper for a non-slip fit
  • 79g (pair)
Rider Reviews (8)
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  • Paul GARDINER United Kingdom 27•01•2014
    Paul GARDINER United Kingdom 27•01•2014
    I purchased these arm warmers to go with the Castelli Gabba windstopper short sleeved top. These are top quality product keep your arms warm and dry. I am 6ft with a 42 chest so I purchased large - the fit was spot on. Delivery service from always riding was first class. Well done - great customer service as always.
    1 out of 1 riders found this review helpful.
  • Oliver Sessions United Kingdom 29•09•2015
    Oliver Sessions United Kingdom 29•09•2015
    Good quality and fit. I use these when commuting on early mornings or nights when its wet and cold as I don't like wearing a water proof unless its raining heavily. Keeps me warm and dry and are comfy and breathable.
    0 out of 0 riders found this review helpful.
  • samson hung Hong Kong SAR China 20•12•2014
    samson hung Hong Kong SAR China 20•12•2014
    Good size, and I was amazed that you feel warm even when you are decenting but can't feel wet inside so very close to body temperature when 10-15 degree , will try again when weather is colder
    0 out of 0 riders found this review helpful.
  • George Turnbull United Kingdom 29•04•2014
    George Turnbull United Kingdom 29•04•2014
    I haven't worn them in the rain yet but warm and fit for purpose. Good wind protection.
    they do come up long in the arm (i'm just under 6ft and have the large) but no major issue.
    0 out of 0 riders found this review helpful.
  • Baikoli Spain 20•12•2013
    Age: 26-36 Gender: Male Riders: Road
    Baikoli Spain 20•12•2013
    Age: 26-36 Gender: Male Riders: Road
    Unos manguitos calientes y que repelen el agua de gran calidad, una gran compra
    0 out of 0 riders found this review helpful.
All product reviews
Browse the Castelli size chart, and find the perfect size of item for your next ride. If you have any fit related questions, please contact us and we can happily assist you.
chest (inches) 36 38 39.5 41.5 43.5
waist (inches) 31.5 33 34.5 36.5 38.5
inseam (inches) 32 32.5 32.5 33 33.5
chest (inches) 31 33 35 37 39 41
waist (inches) 25 26.5 28.5 30.5 32.5 34.5
hips (inches) 34.5 36 38 40 42 44
palm size (cm) 24 24.8 25.4 26.6 26.4
For an accurate glove size, please measure across your flat open palm just below the fingers, then compare your measurement to the chart above. If it's a close call, go one size up or down depending on the result.
shoe size (Euro) 36-39 40-43 44-47
shoe size (Euro) 36-39 40-42 43-44 45-46 46-48

Where is my order sent from?

All orders are packed & shipped from our HQ in South West London the same day you order, if in stock and ordered before 3pm GMT Monday to Friday. That's just how we like to roll!

Delivery Options

 Royal MailDHL Express
UK 48 hr / £3.00 (free when you spend over £60) Next Day (Mon-Fri) / £5.00  
N. AMERICA   2 day, from $14
EUROPE   Next day, from €8
SCANDINAVIA   Next day, from €12
AUSTRALIA / NZ   3 day, from $25
JAPAN   3 day, from ¥2200
REST OF WORLD   3 day, from £20

60 Day Returns

Returns are really simple. We include a returns address label inside every package, so if you would like to return something to us, just make sure to send it back up to 60 days after you have received it. We recommend that you use an economic postal return service to get your order back to us. Please note that for international orders, we do not currently offer free returns.

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