One of the basic weave structures, in which one set of yarns forms a smooth surface. For instance, the warp floats over the top of groups of weft threads, forming a very smooth surface on the top side of the fabric. The warp will go over, say, 4 weft yarns, then under one, then again over four weft, under one, and so on. Said to be 4/1. This will bring the warp to the surface with the weft hardly noticeable. This is a warp surface. Similarly, it can be a weft face, by weft yarns being ‘floated’ so as to make the warp hardly visible. This technique of creating satin is also the basis of brocade weaving.