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Castelli NanoFlex+ Kneewarmers - AW18 is no longer available at Merlin Cycles. However you may find an alternative or updated product below.
Castelli NanoFlex+ Kneewarmers - 2016
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Castelli NanoFlex+ Kneewarmers - 2016

This item was discontinued 23rd December 2019.

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

Code: CS16579010
Castelli NanoFlex+ Kneewarmers - AW18


The Castelli NanoFlex kneewarmers 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 knee to help with ease of movement and enhance the fit and comfort while keeping water protection as high as ever. 



  • Fleece lined to keep knees 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.
leeee Fit perfectly! I'm 5'6 and got small
Ms Thomson Great fit and quite long - which I like I am 5”6 with skinny legs and small is a good fit
Herbert Good quality, they are a bit long, need to pull up quite a bit to make sure the contour (bend) is right on the knee.
Mr Bukovec Ideal for cold days.
Mr Quattrin I didn't find the Castelli size chart to be particularly helpful. I gambled on a size large and am delighted that the fit is perfect. Snug without being uncomfortable. Multiple panels make for a great fit, especially behind the knee. Silicone grip surface on the interior AND exterior of the upper opening of these knee warmers keep everything in place while pedaling. The sale price made this purchase a particularly good value.
Mr Moody New England is geting cooler, but holding of on the winter bibs. These are better than those being rep;laced.Extra length give much better coverage.
Michael Very comfortable. Worn for first time in torrential rain and repelled a lot of moisture but most importantly kept me warm. Would recommend
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 Cusack These were my first try of knee warmers and I am very impressed. Very long as they stretch nearly to my ankles and with socks they look like legging especially when paired with the nano shorts. I went with xl as I’m tall and slim build
Mr Nicholson Fantastic product for chilly mornings, like the arm warmers perfect fit and great price and delivery from Merlin.
Tom Great performing kneewarmer. I'm 5"7, 66kg and purchased the Medium. Fits snug and comfortably.
Mr ellul My go to for knee warmers, they are super comfortable. Not quite as tight as the Sportful No Rain. Much prefer the newer design with smaller branding.
barney Brilliant. Warm and shed water well
Denis Ideal for cooler days of autumn, when you do not need legwarmers or bibtights. Usual Casterlli quality. Quickly dispached, very happy with service.
s. jun Fits well, dense and insulates well from cold air.