Wind tunnel designed and tested, the "hips" provide added downforce while the flip at the tip directs air over the rider to help eliminate the swirl of air found in front of the rider on standard windshields Lexan Polycarbonate with FMR hard coating is used to create these custom-molded designs with unmatched durability All are predrilled for easy mounting using stock windshield hardware Made in the U.S.A.