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
  • Wind resistant
  • Water 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 (7)
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  • 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.
  • 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.
    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.
  • Blackhound United Kingdom 06•11•2013
    Gender: Male
    Blackhound United Kingdom 06•11•2013
    Gender: Male
    Product has worked really well this autumn keeping arms warm and dry. Light rain has beaded nicely but not yet been caught in heavy rain. Personally, do not like the loud graphics, would prefer something more subdued, but this is a minor gripe.
    0 out of 0 riders found this review helpful.
All product reviews
Castelli apparel used to be very small, but over the last few seasons they have restructured their size set for a more international rider base, so the size, whilst still fitted, is not overly small. Therefore, please follow the sizing chart with confidence, but if in doubt, then feel free to go up a size.
chest 36-38" / 92cm 38-40" / 96cm 40-42" / 100cm 42-44" / 105cm 44-46" / 110cm
waist 31" / 80cm 33" / 84cm 34" / 88cm 36" / 93cm 38" / 98cm
inseam 31.8" / 81cm 32" / 82cm 32.7" / 83cm 33" / 84cm 34" / 85cm
short size S-M S-M L-XL 2XL-3XL
weight 45-60kg 60-70kg 70-80kg + 80kg
palm size 9.5cm 9.8cm 10cm 10.5cm 10.8cm
*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) 35-39 40-43 44-47
Shoe Covers S M L XL XXL
shoe size (Euro) 39-40 41-42 43-44 45-46 47-48

Where is my order sent from?

All orders are sent from our HQ in Hampton (near London!) & despatched the same day (Mon-Fri) if in stock and ordered before 3pm UK time. That's just how we like to roll.

Delivery Options

 Royal MailExpress
UK Tracked 48 hr / £3.00 (free over £60) DPD Courier 24 hr (Mon-Fri) / £6.50 (free over £200)  

Free delivery for orders over £60

All UK orders will receive free Royal Mail Tracked 48 hour delivery with only a £60 minimum spend. Next working day DPD delivery is also available with orders over £200.

N.Ireland & Scottish Highlands

Customers in the Highlands and Northern Ireland will be offered a next day service with Royal Mail on checkout, rather than DPD.

Free UK Returns

Returns are really simple. We include a free returns postal label and order slip inside every shipment, so if you would like to return something to us to us, check off the item(s) to be returned on the slip, peel the shipping label, stick it to the exterior, then take the parcel to your nearest Post Office, or simply include it in your daily postal pick up from work.

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