Knitting in Fair Isle involves working two or more colors on one row of a pattern. It isn't much more complicated than knitting or purling in one color, but it can produce some really stellar fabrics. basically, you'lll work a few stitches in one color, then the next few in a second color--both balls of yarn always staying attached to the work. The color that isn't being worked is carried across the back of the knitting, making a snug loop, a "float," before being worked again. Floats add thickness and warmth to a garment, as they essentially add an inside lining to the sweater. Most Fair Isle patterns only call for two colors in any given row....