Warm breathable Arm warmers with Castelli's advanced Nano silicone treatment for fantastic water resistance. Nano Flex fabric behaves just like Thermoflex fabric in dry conditions, but provides unbelievable water repellency when it starts to rain.
Top Features of the Castelli Nanoflex Water Resistant Arm Warmers - Red
Water-resistant Nano Flex fabric
Same breathability, stretch and warmth as our standard thermoflex warmers