These three hats are quick and fun to crochet. They were a special request from my niece when she was going through chemotherapy. The profits from the sale of this pattern are donated to the Leukemia & Lymphoma Society in honor of my niece and mom who have survived these difficult diseases. This pattern is written in U.S. terms. BASIC SKILLS NECESSARY You should already know how to ch, sl st, sc, hdc an dc. Additional stitches are explained in the instructions, such as dc2tog and dc4tog. SIZING / FINISHED MEASUREMENTS One-size adult hat.