Crin, also known as crinoline or horsehair, is a synthetic netting made from polypropylene. It comes in various widths. Because it is lightweight and stiff, crin can be used for making brims and trims, and to reinforce bows. It is often used in fashion design, to add structure to hems, sleeves, and skirts, and in costume making. Crin comes in many colors, as well as patterns, metallic threaded, and pleated variations. It often has a gathering thread woven through one edge, for gathering and shaping. As it is a synthetic material, crin will melt and harden but it is not dyeable. It also comes in a tubular shape, as shown in the photo above.