The Tri-Tech fit of the Crossbow frame offers universal fit, maximum comfort and zero pressure points. As part of the ESS Cross-Series eyeshield platform, all Crossbow components are compatible and fully interchangeable with the ESS Crosshair and ESS Suppressor . For example, you can upgrade a Crosshair to premium Crossbow anti-fog lenses--including ANSI-rated Polarized--or adapt for hearing protection use with the ultra-thin Suppressor frame.