Unisex Adult Knit Beanie for Men Women Warm Snug Hat Cap

Is this machine washable?

What is the material of this hat? Looking at purchasing white ones to tie dye but I need them to be a high cotton content.

I see this is made of "acrylic cotton" is it a new breed of cotton? How do the acrylic cotton plant look slike?

Does the beanie come in an actual shade of white or just a cream6 shade of white?