Gauge is 19 sts=3” in seed stitch.
From the pattern:
A Möbius strip is a strip that has only one side and one edge. It is made possible by simply placing a half twist in a strip before you join its two edges. August Möbius conceived of this ingenious strip in September 1858, and in his honor, Libby Grant has incorporated it into an exciting hat in fall colors. It can be worn as a stylish chemo cap, or as a fun topper for any occasion.