FIBF-5500 / F-5500 FACESHIELDS HIGH PERFORMANCE HIGH PERFORMANCE® Faceshields for Use With Proctective Caps HIGH PERFORMANCE® Faceshields, with 4" or 7" deep crown protectors, feature the adjustable Speedy® Mounting Loop System. This allows users to easily put the faceshield on and take it off while a protective cap is on the head. No tools or modified caps are required, and this mounting system does not affect ANSI rating.