Spacer fabrics are made on a double needlebar machine similar to a simplex machine except that there are multiple layers of yarn fed by separate spools, working back and forth between the needlebars. A typical spacer fabric has one or more bars of mono-filament yarn running back and forth betwen the needlebars while other bars of yarn are forming the front and back of the fabric, either in plain or pattern. Spacers can have a multitude of different patterns on the front and the back as well as different thicknesses and compression resistance. Spacers are used wherever either a cushioning agent or bulky appearance might be needed. Spacers are highly engineered, high performance fabrics. They are used to replace traditional laminated (fabric to foam) products but cost versus performance versus aesthetic analysis must be made.