This Helmet Cover has a stretch fit to keep the cover in place during Freefall and Rotary Wing operations. There are cutouts in key areas of the cover to allow NVGs to be mounted, as well as helmet rail accessories. Loop is located on the helmet cover for attachment of IFF devices. This Hybrid model has a semi-mesh construction. A great way to change the camo pattern of your helmet, preserve the surface of your helmet, and dampen noise during blunt impacts.