In rainy conditions, knee warmers deal with the very same problems that legwarmers do. Generally, the fabric takes in water and their capability to keep your joints warm becomes jeopardized. Lucky for you, the Castelli Nanoflex Knee Warmers have remedied the issues that challenge knee warmers in cold and damp conditions. Nanoflex is an exclusive Castelli fabric. The mill starts with Castelli's super-warm and ultra-stretchy Thermoflex fabric (used in numerous of its winter pieces) receiving an outside finishing of ultra-tiny nanofilaments of silicone fiber. These fibers develop a near water-proof obstacle to wetness, and raindrops run the fabric without soaking through. In spite of its waterproof finish, Nanoflex fabric remains highly breathable, keeping you comfy in almost any condition. Silicone leg grippers keep the knee warmers in location on the hardest rides. But, bear in mind that they do run longer than some that we've seen-- more properly, they range from mid-thigh to the bottom of the calf. Last but not least, Castelli printed reflective logos at the knee and on the side of the calf in order to increase your exposure to motorists in low-light conditions. The Castelli Nanoflex Knee Warmers are available in 4 sizes from Small to X-Large and in the colors Black, Red, and White. Please note that Castelli recommends putting on these warmers in temperature levels varying in between 50 and 60 degrees Fahrenheit.