Yarn comes in all different thicknesses, or weights. The standard yarn weight system goes from a range of 0 to 7, with size 0 (or lace yarn) being the smallest weight (or thickness) and size 7 being the largest weight.
Click on yarn weight listed below to check out our handy chart of yarn weight and recommended knitting needle and crochet hook sizes along with links to variety of yarn available in that weight.