Therm-a-Rest SpaceCowboy 45F/7C Sleeping BagUltralight summer sleeping bag. The feather weight Space Cowboy is built with eraLoft synthetic insulation to endure the rigors of backpacking and cowboy camping in variable conditions. Designed with innovative Therm a Rest features like SynergyLink Connectors and Zoned Insulation, the bag is among the lightest and most packable in its class. The mummy style bag compresses down to take up minimal room in your pack and comes in two outdoor inspired