Headphones sponge shader

After saw this “Vintage Sony Walkman professional”, I wanted to make a sponge for the headphone and I got out a nice result, but I’m not a great nodes user, and when I was writing this post, I also had a suggestion, about similar topic and there is a good sponge material here, and now I will look on it and use it to improve mine. Anyway if other users can do better one, I appreciate.
Here my results

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