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Castelli Nanoflex Leg Warmers

Leg warmers should be part of every cyclist's 3 season wardrobe because they all offer cool-weather protection and can be easily removed or put on when conditions change. They also allow you to use your preferred bib shorts and add a lot of value when compared to the expense of a full tight with chamois.

At first glance, the Castelli Nanoflex Leg Warmers appear to be a standard issue fleece lined warmer. Looks can be deceiving, as the Nanoflex treatment take this product to the next level. This Nanoflex treatment consists of a coating that is constructed from millions of microscopic filaments. The grouping of these filaments provide protection from wind and water, but are just porous enough to release moisture and perspiration from within. Nanoflex is soft and elastic which leaves the garment feeling comfortable yet supportive.

The Nanoflex Leg Warmers offer unparalleled protection from wet and windy environment, while being soft, flexible and comfortable (dare we say cozy). They work in the 3 season 45-65ºF sweet spot temperature range. Castelli was clever to place the gripper on the inside and outside, so the warmer holds the warmer from sliding down your leg and the short leg from slouching simultaneously. Nanoflex works best when it is a snug fit, so do not expect these to feel loose with bunching and a gathering of material. They are designed to fit tightly. A handy 6 inch ankle zipper on each cuff make the leg warmers easy to put on or take off.


  • Water-resistant Nanoflex fabric
  • Same breathability, stretch and warmth as Castelli's Thermoflex warmers
  • Great in every possible condition
  • 6 inch ankle zippers
  • Reflective details for safety

Nanoflex starts out as the Castelli Thermoflex fabric. This fabric is then treated with a 5 layer microfilament coating that provides a weather barrier. Thermoflex + proprietary microfilament coating treatment = Nanoflex.

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