Castelli Nanoflex Leg Warmers

Priced: $44.93 - $69.95 Rated:   - 3 stars out of 5 by 4 reviews.
Castelli Nanoflex Leg Warmers
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Color: Red
Available Colors:
REI $44.93
35% off
Regularly: $70.00 $69.95
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Castelli Nanoflex Leg Warmers -

If there's one failing to most legwarmers, it's that they absorb water like a proverbial sponge. On rainy days, they end up waterlogged and providing compromised warmth. However, the Castelli Nanoflex Leg Warmers are perfect for riding in conditions that are both cold and wet. Then again, outside of Mojave heat levels, we can't think of any condition that won't benefit from Nanoflex.

Nanoflex is a proprietary Castelli fabric. The mill begins with Castelli's super-warm and ultra-stretchy Thermoflex fabric (used in many of its winter pieces) receiving an exterior coating of ultra-tiny nanofilaments of silicone fiber. These fibers create a near waterproof barrier to moisture, and raindrops run off the fabric without soaking through. Despite its water-resistant finish, Nanoflex fabric remains highly breathable, keeping you comfortable in almost any condition.

Silicone leg grippers keep the Nanoflex legwarmers in place on the hardest of rides, and ankle zips make them easy to get past the largest feet. And lastly, reflective logos are printed at the knee and below the calf in order to increase your visibility to motorists in low-light conditions.

The Castelli Nanoflex Leg Warmers are available in four sizes from Small to X-Large and in the colors Black, Red, and White.


  • Stretch Nanoflex nylon/spandex fabric blend moves effortlessly with your body; brushed interior offers moisture-wicking and insulating properties
  • Flatlock seam construction is soft and non-chafing next to skin
  • Castelli's Nanoflex fleece fabric not only insulates; its water-repellent outer surface of microfilaments causes water to bead and roll off, keeping you dry as well


  • Order the same size warmer as your shorts


  • Reflective logo increases your visibility to motorists in low light


  • Double-sided silicone gripper keeps warmers snug in place

Great for cool training days and rainy weekend group rides, Castelli Nanoflex cycling leg warmers provide cold and wet weather protection and pack away small when not needed.


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Average Price History: Price History
Review RatingNumber of Reviews
Fabric:86% nylon/14% elastane
Sun-protective fabric:No
Warmer type:Leg warmer

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Castelli Nanoflex Leg Warmers Reviews:

Positive Reviews:

I ordered a small, like all other legwarmers ever. I am a female and usually wear small shorts and leggings. I couldn't get these over my calves as a small, so I am returning them. I can't speak to the quality, but they seem nice like all other Castelli stuff.

marp830089 at on 11/14/2013

The nonflex are the only way to go. Great item, and allows you to reduce the amount of winter wear, without feeling the effects of the cold

Nicholas Clark at on 12/05/2013

Negative Reviews:

I'm not sure what Castelli had in mind with these, but they felt like I was wearing cardboard. At the end of a 50 mile ride, the skin at the back of my knees was rubbed raw.

jmap301872 at on 01/05/2014

Neutral Reviews:

Just put these back on after a hot summer and noticed that the material around the knees was flaking off. Not sure this is designed to happen after one season.

Feldy at on 10/15/2013