vegan boots

Hi, I'm on the hunt for some synthetic/vegan knee high boots in black for the winter but I have freakishly skinny legs (calf at widest is only 30cm). Any boots I've found that specialise in boots for skinny legs all seem to be real leather :-( Has anyone with a similar issue had any luck...

https://eddeke.wixsite.com/vegasvegan/featured