Homasote is used for blocking knit or crochet pieces. Original hockey jerseys were actually heavily knit sweaters. Synthetic fibers can be knit and woven similarly to natural fibers. Weft-knit fabrics may also be knit with multiple yarns, usually to produce interesting color patterns. Vertical stripes (ribbing) are possible by having alternating wales of knit and purl stitches. Horizontal striping (welting) is also possible, by alternating "rows" of knit and purl stitches. Mesh is a high-tech synthetic composed of ultra-fine filaments that are tightly knit for smoothness. Group refers to the degree people are tied into a tightly knit community. The group was tightly knit and everything was communally shared. For this end, we must be knit together, in this work, as one man. Robertson said that they would knit together during down-time on set. Mark collects antique calendars and likes to knit. The elephant has one of the most closely knit societies of any living species. In 2003 Innocent began a project called the Big Knit. Five Great Charters knit the land.