These helmet covers are made of latex nylon instead of cotton and are cut up so that when they are worn, you can not make out the shape of the helmet, improving the camouflage effectiveness. 
They are reversible to a forest green on one side and a dark brown on the other.
The cover is held onto the helmet with the use of clips. The clips are small and will not fit over a PASGT or anything similar. These are best used for an M1 helmet or a French M51 helmet
 
These are worn, so please expect small tears, fading, and/or fraying.