1970s F1 - airboxes

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After watching Rush and seeing old F1 on youtube/tv (and reading on wikipedia), the high airboxes were banned during 76. Any idea why?

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Thanks! Now to find out what the leathery look stuff on James Hunt's helmet was for...

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Something fire-retardant was my thought tbh. Just odd not seeing anyone else use something like it.

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Although long before my time I like the look of the mid-60s F1 cars before the introduction of wings. Look like a proper car imo!

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I like that animation - pity it isn't 10x slower.