Starting with Red, cast on an odd number of stitches to the desired size.
Row 1 and 2: Knit across.
Row 3: Add the White yarn and *k1, k next st by inserting needle in center of st in row below, knitting through both loops *; repeat between *s to within 2 sts of end, K2.
Row 4: With white, k across.
Pick up Red yarn and continue in pattern. Repeat rows 3 and 4 alternating the colors until desired length. Last two rows should be White, then add two rows of Red to finish off.