Castelli NanoFlex Arm Warmer: Due to the anatomic shaping and lightness, the Nano warmers feel more natural and bunch less than other windproof warmers. The front side of the warmer blocks the wind with StratoLight. The back side of the warmer has super flexible Action PowerLycra® fabric. The two panels are joined by flatlock stitching. Silicone on the inside and outside of the warmers keeps your jersey or shorts from riding up on the warmer and reflecting treatments make sure you’ll also be seen in the dark.
