Technology allows businesses to be global operations, and even the smallest business can have clients in every time zone. Different countries and different cultures may have different preferences, however; what sells well in one place may never sell in another place.
Circular knitting or knitting in the round is a form of knitting that creates a seamless tube. When knitting circularly, the knitting is cast on and the circle of stitches is joined. Knitting is worked in rounds (the equivalent of rows in flat knitting) in a spiral. Originally, circular knitting was done using a set of four or five double-pointed needles.
Double knitting. Double knitting is a form of knitting in which two fabrics are knitted simultaneously on one pair of needles. The fabrics may be inseparable, as in interlock knitted fabrics, or they can simply be two unconnected fabrics. In principle, an arbitrary number n {\displaystyle n} of fabrics can be knitted simultaneously on one pair of knitting needles with n {\displaystyle n} yarns, as long as one is careful.