Cheyenne Open Back Dress Cheyenne Open Back Dress Self: 100% poly Lining: 97% poly 3% elastane. Hand wash cold. Fully lined. Textured crepe fabric. Surplice skirt. Back cut-out with button closure. BTWR-WD398. BTD162 S18. superdown is a contemporary label offering on-demand, on-trend, on-social apparel. Always on the pulse of the latest styles, superdown is the go-to for aspiring, trendy, fashion-loving babes who are #superdown for anything.