Leg warmers should be part of every cyclist's 3 season wadrobe 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 prefered bibshorts and add a lot of value when comapred 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 decieving, 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 unparraleed protection from wet and windy environement, 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.
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.