Is wool felt or fiber cotton better for painting and calligraphy felt?

When I went to buy a painting and calligraphy felt, all the shops were made of wool fiber, and wool always shed. As far as I know, because I make painting and calligraphy felt, I use environmentally-friendly raw materials, but my supplier is Dongguan Zhicheng fiber needled felt, which is qualified in quality, uniform in thickness and strong in ink absorption.