Underwriters Laboratories (UL) Inc. test 2218 simulates hailstones falling at peak velocity, and designates products with the most impact resistance Class 4.  IBHS recommends UL2218 Class 3 or 4 products in hail-prone regions. 

The following link takes you to the list of UL Certified Clients for Roof Covering Materials, Impact Resistant, UL2218.  Click on a manufacturer's file (far right column) to find out the class rating for their product.   Click here