Elvex chainsaw chaps meet the requirements of ASTM Standard for Leg Protection for Chain Saw Users (F-1897-2008). This standard requires that the chaps can stop a chain saw running at 2,750 feet/minute tested at both 45 degrees and 90 degrees to the longitudinal axis of the test sample, under controlled laboratory conditions. Compliance tests are performed by Underwriters Laboratories (UL) in accordance with ASTM F-1414, Measurement of Cut Resistance to Chain Saw Lower Body Protective Clothing. The performance requirements previously were 2500 feet per minute chain speed.