Sorry, this product is no longer available!
Castelli NanoFlex+ Armwarmers - AW18 is no longer available at Merlin Cycles. However you may find an alternative or updated product below.
Castelli NanoFlex+ Armwarmers
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Castelli NanoFlex+ Armwarmers

This item was discontinued 20th January 2020.

If you require help finding an alternative to this product please contact customer services.

Code: CS16577010
Castelli NanoFlex+ Armwarmers - AW18


The Castelli NanoFlex armwarmers have been part of their collection for 7 years now and during that time have become recognised by those in the know as the very best in protection from the elements. This latest version sees a new additional fabric – Nano Light added to the back of the elbow to help with ease of movement and enhance the fit and comfort while keeping water protection as high as ever. 



  • Fleece lined to keep arms warm
  • Highly breathable
  • Fast drying
  • Improved UV protection
  • Great in any cool, wet condition
  • Repels water droplets from rain and road spray
Mr Wong Fleece texture on the inside. Fit is good.
Mr d’Entremont Comfortable fit and warm.
Cirilo I`m really impressed with how good these nano flex products from castelli are
Mr coombs Excellent arm warmers. Very comfy and warm as you would expect from Castelli. Fast delivery and excellent price
David These are the first arm warmers I own so I have no comparison. Been using them in temps of 5-10c and they keep me warm and dry.
Leeee Just as what I expected - very warm and the right size
Hugh Non-slip on both inside and outside of upper arm, stays in place nicely. Sizing is as expected for Castelli, and even my modest guns need XL to avoid cutting off the circulation!
Mr Podhajecki Good quality perfect fit double silicon grippers
Herbert I am ready for winter riding, fits well, good quality and warm. Arrived in good time!
Mr miller Warm, comfortable, nice design and stay in place well ....and as with most Italian kit very snug so size up!
Mr Jackson Bought as a spare set for autumn. Perfect for this time of year
Mr campbell These are the perfect complement to the gabba jacket. Warm and shed water. Great deal on these at Merlin.
Mr Owens Fantastic service from Merlin cycles. Product was a great fit, the grippers at the top of the arms work well and the fleece lining feels warm and comfortable. Great product at a great price.
Mr KIM Warm and waterproof
Alfur the elf Good insulation for cold or rainy days but still can be used on a little bit hot days as its quite breathable... would totally recommend as price is really cheap... 65kg with sticks for arms and legs but medium fits snug and really well...
Mr Osman Second pair of these. Good fit. Stay in place. Great for autumn/spring riding. Warm and water resistant. My go to arm warmers. Looks great with any coloured Jersey. Also a bargain!
Mr Cusack Great quality, warmth and water resistance. Size L to match an xl jersey as I have skinny arms
Mr Nicholson Fantastic fit nice layer for chilly days and easy to store. Great price and delivery from Merlin.
Mr arthurs Great arm warmers that keep the rain off
Paul Srodzinski Comfortable, quite close fitting. May stretch after time
Tom Great performing arm warmer. I'm 5"7, 66kg and purchased the Medium. Fits snug and comfortably.
GC Great product. I've tried a few other brands in the past but these feel the best and hold their shape well. They don't feel too bulky, tight or restrictive. Great weather protection down to 0°C.
Mr Smith Great fit . I bought the large and OK for me . I am 5ft 9 and around 11st 7lb.
PJS I like the wind protection and the ability to repel mist. I bought a size smaller, I like a tight fit.
Mr Fogel Absolutely love them. Very soft inside and extremely warm.
baiu I'm 180 cm, L fits ok to me, snug but comfortable. I've got normal arms, not too skinny , if you have big arms it's going to be very tight.
Recep AKSOY Castelli does a pretty good job in cycling. Good quality with Castelli quality and reasonable prices from Merlin Cycles. A standard "s" body. I'm a 65kg 170cm tall man. I ordered a "S" size. Good quality fabric. Water-repellent outer fabric. I tested it under the fountain :). It doesn't bother in hot weather. A product that can be used not only in cycling but also in daily life. Merlin Cycles to send thank them for 5 days in Turkey. If you order your products from entering the country after Turkey sent with PTT. Your products are delivered late due to PTT density. You can take PTT KDTM yourself to be fast.
Mr CANDAMO Excellent product for the cold and rainy days
Mr Simpson Really happy with these - using them for winter riding with a Gabba and they work beautifully. I do start out a little cold - as a winter set up this is for hard riding rather than a leisurely cruise - although I'm sure they'd be good for that for 3 seasons. Excellent delivery etc from Merlin - and cheap too
Mr Williams Among the best arm warmers out there, brilliant wind proofing and surprisingly good at repelling water
James Simple, warm and highly effective.
Geoff Nano flex is not entirely waterproof but in combination with the slight brushed interior means these are ideal in all but winter down-pours. I have a pair of leg warmers in the same material and they span the gap between longs and shorts in terms of weather conditions.
Lavren Runs really small. I'm 5'7" 130lbs and M is pretty tight, I'd probably go with L if I knew they run that small, but I don't want to deal with the hassle of returning them.
Mr Tesmer Purchased the size large that has a very comfortable fit. Perfect on a cool windy day with moisture in the air.
Mr Cross These are much better than the previous version and worth the extra cost. They're far more comfortable around the elbow and the logos are more subtle. Highly recommend these.