This tutorial uses both knitting and crochet to create a boot cuff. It is an advanced tutorial. You will need to know how to knit and crochet in the round.
You need to download the PDF pattern here:
by MJ's Off The Hook Designs
by Dayna T
by Hectanooga1 - Crochet, Knitting,
by BAG-O-DAY CROCHET & MORE