This is the smaller hole variation of the US M1 Helmet net. This particular model is 100% cotton, olive drab in colour, and has 1/2" spacings. This helmet net is original and has been used.
I have found a small batch of these, which is quite rare. Each net comes with a draw string and is easily tucked between the helmet shell and liner. This style of helmet covering saw wide use by both infantry, airborne and support units.
* Helmet in picture is not included