If you have a Swiss model 1971 helmet, you definitely need a cover to go with it. Not much more to say about these covers, other than they're made from one of the most unique camouflage patterns ever fielded.
NOTE: These are all used, so please expect wear normal with military use. This includes but is not limited to fading, tears, stains, and other various minor imperfections. That being said, I try to inspect each cover before they get sent to you, so you won't receive an unusable cover by any means.