Best curtain material to avoid shrinkage

[Blue_Runner]

B - my enclosure is made of some type of vinyl stuff. Pretty dang durable and virtually water proof. Shrinkage has not been a big issue except in the cold of winter she shrinks some, but always limbers up in the warm weather. When winter fishing I have even put the curtains inside the truck to warm them up before trying to snap them in just to avoid the issue.