The Eureka Nightshade Sleeping Bag series packs performance grade materials and construction into a traditional rectangular bag design. Utilizing Eureka's Stealth-Grip fabric technology, this bag is part of the Camp Comfort Sleep System. The Camp Comfort System uses Stealth-Grip fabric technology, your Eureka! sleeping bag, mattress and tent floor work together seamlessly to ensure that you don't go anywhere except for soundly asleep all night long.