Western Mountaineering Sonora Sleep Liner Polyester Sky Blue Taper Regular. Specifications for Western Mountaineering Sonora Polyester Sleep Liner: Manufacturer: Western Mountaineering Application: Camping Fabric/Material: Polyester Lining Material: Synthetic Features of Western Mountaineering Sonora Polyester Sleep Liner: Made in India Drawcord closure Package Contents: Western Mountaineering Sonora Polyester Sleep Liner Western Mountaineering 60SONLNTR: Sonora Sleep Liner Polyester Sky Blue Taper Regular