UCast on 60 sts. 2 rows 2x2 rib in black, 2 rows 2x2 rib in red, 2 rows 2x2 rib in black.
30 stitches for heel in red in eye of partridge stitch, 8 sets of 4 rows. Knit one row then start heel turn on purl row.
Sl1, p16, p2tog, p1 turn
Sl1, k5, ssk, k1, turn
Sl1, p6,p2tog, p1, turn etc until all heel stitches used
Pick up 17 sts on each side of heel flap with black. Knit to end of row in black.
4 row stripes, decrease for gusset on 2nd and 4th rows to 58 sts total.
13 stripes to toe. Start toe decreases on last red stripe. Switch to black to finish toe.