Warp knitting, unlike weft knitting is constructed from many single elements or yarns working vertically and in a zigzag formation. Warp knitting requires the same number of separate strands of yarn, or 'ends', equal to the number of stitches in a row widthways. The vertical rows are interconnected by travelling a yarn diagonally, looping with the adjacent yarn to one side and travelling back again on the diagonal to loop with the adjacent yarn on the other side.
Due to its more complex construction to weft knitting, warp knitting is almost exclusively done by machine rather than by hand. The two most common warp-knit fabrics are tricot and raschel.