Hello, I'm wondering what type of liner it is. The pattern of the fiber is strange, in a wavy/swirly pattern. I've never seen this before, so I'm just trying to learn more. This particular helmet is from an ebay auction of a pretty questionable 502nd helmet.
If you're interested in the helmet in question, here is the link, but I am just wondering about the liner: WWII Helmet Airborne Markings w Liner | eBay