|Prolar is Elvex brand name for our exclusive chainsaw protective pad. Prolar is not a static product, but is going through continuous development, in order to improve the compromise between performance and comfort. The unique explosive action of Prolar works by jamming the chain against the bar and sprocket. Prolar combines light weight and flexibility for superior user acceptance while providing highly effective protection. Elvex Prolar pads have been tested by Underwriter's Laboratories (UL) for conformance to ASTM F-1897-2008. This test establishes a pass or fail in regards to the 2,750 feet per minute requirement.