These highly elastic arm warmers are the top offering from Pearl Izumi. They feature a thin-fleeced backing that's woven to a spandex front fabric. The warmer is constructed of two panels, both of which are anatomically cut, so the clone your arm perfectly. This cuts down on bunching and gathering of excess material on the inside of the elbow. The upper hem of the warmer features a jacquard-style woven band. It is comfortable and will not allow the garment to sag. Small silicone dots help further to keep the arm warmer in place. The warmer bears Pearl's Barrier designation which means it is DWR treated for added protection from the elements.