It's def a "buzzword bingo" thing. Basically, the 7X4 has trace amounts of fiberglass mixed with the carbon fiber.
I argued with the TRUE rep when doing booking for 2024-2025 product because I didn't understand the value of the 9X4 compared to the 7X4 if the boot itself was the 100% the same. If you look at both, you wouldn't be able to tell the difference visually. However, the actual composition is different.
I agree 100%, composite = made up of various parts or elements. I hate "buzzword bingo". It makes me die a little on the inside when I see marketecture.