Castelli Nanoflex Arm Warmer Black, XL

It's tough to make an armwarmer warmer. If we know we'll be riding in conditions in which a pair of armwarmers won't keep us sufficiently warm, we tend to choose a thermal jacket. But what if the day could be intermittently cold and wet? The Castelli Nanoflex Armwarmers are designed for days that could bring you everything from cold and wet to enough sun to peel them down. Nanoflex is a proprietary Castelli fabric. The mill begins with Castelli's super-warm and ultra-stretchy Thermoflex fabric, used in many of their winter garments, and then coats the outside with ultra-tiny nanofilaments of silicone fiber. These fibers create a near waterproof barrier to moisture, and raindrops run off the fabric without soaking through. Despite its water-resistant finish, Nanoflex fabric remains highly breathable, keeping you comfortable in almost any conditions.Silicone arm grippers keep the Nanoflex Armwarmers in place even on the hardest rides, and reflective logos are printed at the elbow and lower arm to increase your visibility in poor light conditions.The Castelli Nanoflex Armwarmers come in Black and in four sizes from Small through X-Large.