In traditional Double Knitting, two separate stockinette fabrics are knitted at the same time and have the flat (or knit) side of the fabrics showing with the bumpy (or purl) side of each fabric hidden. IODK is the acronym for 'Inside Out Double Knitting'. This differs from traditional Double Knitting in that both "public" sides of the knitted item are in reverse stockinette stitch having the flat (or knit) side of each fabric hidden. This book explores how to use the IODK technique to create accessories with different looks and textures than what is normally associated with double knitting.