Woolf Arm Warmers benefit from our proprietary UF Active fabric, a merino and polyamide blend that combines the best attributes of natural and synthetic fibers in one high performance material. Not only does UF Active offer best-in-class thermal efficiency and warmth, even when damp, it can withstand the effects of light rain and road spray thanks to the DWR treatment. The ergonomic, pre-shaped fit keeps the warmers in place for the whole ride. Eye-catching reflective trims enhance your visibility on the road especially in gloomy conditions.