With A, cast on 48 sts.
Work in St st (k on RS, p on WS) until piece measures about 16 in. (40.5 cm) from beg, end with a RS (knit) row.
Knit next row (on WS) for fold line.
Continue working in St st until piece measures about 16 in. (40.5 cm) from fold line.
Following package directions and leaving long tails on each pom-pom, make medium pom-poms as follows:
17 with A, 19 with B, 19 with C, and 8 with D.
Following diagram, and using long tails for sewing, sew 7 rows of 9 pom-poms each onto one half of Cover (between fold line and one edge).
Fold Cover along fold line. Seam 3 open sides closed, leaving an opening for stuffing. Stuff Cover with fiberfill, then finish seaming closed.
Weave in ends.