Jackman Crepe Umps Jacket - Iron GrayCotton nylon crepe is a material woven using 80 1 ultra fine cotton for the warp yarn and nylon and polyurethane processed yarn for the weft. Using the difference in the shrinkage rate of cotton and chemical fiber, it creates wrinkles and reduces the contact area with the skin, so you can wear it smoothly. The material itself is light and thin, hard to steam, and has excellent stretch and quick drying, so you can wear it comfortably even in summer.