I don’t know what this stitch is called but it uses two contrasting yarns which alternate on each row. You end up with a fairly bulky fabric with a different color on each side. Depending on the size of the hook and yarn weight, you can end up with a heavy, dense fabric to keep even the coldest day at bay, or a lighter (relatively anyway) fabric. This can be used for any project that needs to be thick, such as potholders, trivets, afghans, baby blankets, and even bedspreads.