Zach Pinawrote a review of Castelli Nanoflex Arm Warmers on April 27, 2013
Familiarity: I've used it several times
Castelli really hit a home run with the Nanoflex fabric ? it's brushed for warmth, and repels wind and moderate moisture (rain, snow, etc.) with relative ease. No wonder why the Garmin guys insist on this stuff. Downside: zero articulation in the construction. No elbow bend or shaping makes the warmers bunch up where your arms bend. Not exactly uncomfortable, but not ideal either. Still a great product.