superdown Sierra Knit Top in White. - size XS (also in L, M, S) superdown Sierra Knit Top in White. - size XS (also in L, M, S) 83% viscose 15% nylon 2% spandex. Hand wash or dry clean. Partial front hook and eye closure. Ribbed fabric. Imported. SPDW-WS1297. SDS1732 S20. 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.