Xeon,
It's called Ultra Lace and it's the TL 800. It's finer than Super Fine Swiss lace. But the factory recommends a maximum density of 60% on it because it's so fine. That's the trade off for this fine lace. It's made of the same translucent material that is used in both SFS and French lace so it allows the color of the color of the scalp to show through. Ultra Lace is great stuff but it's delicate and made for medium light or less density.
Regards,
John