I ordered the ODG helmet cover and here it is. At first I was a little worried that it wouldn’t stay secure but so far, no worries.
The Orion Design Group helmet cover is available in two cuts, for the Ops-Core FAST and Maritime helmets. It features a durable four-way stretch fabric that is weather resistant and offers a snug fit. Multiple tie down points and printed loop offer a secure attachment point for optics cabling and IFF. The cover also includes a built in strobe bungie to secure an IR strobe. Manufactured by London Bridge Trading in the USA and available in MultiCam.