The OEM Skullerz Valkyrie Glasses Foam Gasket Insert EGO54991 is designed to enhance the comfort and fit of your Valkyrie medium-frame safety glasses. This gasket snaps into place at the temple corners for easy installation and can be removed for cleaning or when not needed. Its dynamic construction allows for use with a retainer strap, ensuring a snug and secure fit. Please note that the Valkyrie safety glasses are sold separately.