reinforced on its back with a laid-in thread, which forms no loops and is positioned and held in place by a a number of hooks. The laid-in thread is typically of vigogne yarn. Application of a laid-in knit makes the base fabric less extensible, can create effects of relief and colour, and increase a fabric's finish and insulation capacities. Depending on the production technique applied and their qualities, l.-i. k. and f. are categorized as: a) simple lay-in, in which there is only one laid-in thread in each row