Foster in Midnight - Undyed Light Gray and Thin Felted Midnight - Customizable with all yarn colors. Foster is a tonal interplay of toothy weaves in an elegant gingham check pattern. A flatweave rug made from undyed heathered and felted wools, Foster is available in 3 rich colorways: Black, Midnight and Wisteria. The last mill built during Fall River’s textile boom, The Foster Spinning Company was added to the National Register of Historic Places in 1983.