Like snowflakes
48% cotton, 29% acrylic, 23% polyester
Each material has its advantage.
Cotton provides the necessary softness to feel good. But it's impossible to have an original texture with just cotton...
Japanese acrylic adds relief and gives a texture similar to wool. The fabric is then brushed to obtain a voluminous flannel.
Polyester fibers, on the other hand, are dyed and then mixed with cotton, giving the fabric its mottled effect.
In the end, you get a very robust "sumo weight" oxford of 209 gr/m², with a very intricate mottling.