GRANIT MELANGE 152 version is not 100% cotton

The dark gray version is not 100% cotton as described, but only 60% cotton and 40% polyester. I only found this out after washing. So this is not what I wanted. For the rest, it fits tightly and is just long enough for my length (XS version) - most are overly long, Which I hate.

The NATURAL WHITE MELANGE 091 is 100% cotton. Why the difference, I do not know.

Update 1 December:

The dark gray version with 40 percent polyester looks bad after a few washes. The shirt is pilling everywhere; that's why I want 100 percent cotton. Stay away from the dark gray version!