Single rib knitting pattern is formed by alternating knit and purl stitches to form vertical columns. It produces a very elastic reversible fabric that is generally knitted on a smaller needle, than the main fabric to keep it firm.
Single rib is widely used on the edges of pieces (for example cuffs, necklines and turtlenecks), where you need a snug fit, because it’s stretchy and doesn’t curl. It’s also very popular as the ribbed basis for sweaters, hats, gloves, mittens etc.
For single rib you’ll need multiple of 2 + 2 edge stitches. Work the right side following the diagram. Work all stitches on the wrong side as they appear.
Row by row instructions:
Row 1: (and every odd row): edge st, * p1, k1*, edge st
Row 2: (and every even row): edge st, *p1, k1*, edge st
Repeat rows 1 and 2