100% European flax. To effectively filter light without blocking it entirely, the following colors are cotton lined: White, Natural Flax, Midnight, Cedar, Dark Olive, Pearl Gray, Ocean. The following colors are unlined: Dark Flax, Celadon, Marina Blue, Olive Melange, Terracotta Melange, Silver Mist, Sand, Granite, Charcoal. 2-in-1 construction with dual hanging options: rod pocket (bunched) or back tabs (pleated). Opaque fabric blocks most light and helps insulate windows.