Kelty Camp & Hike Cosmic Synthetic 0 Deg Sleeping Bag Fired Brick/Smoke Regular 35428520RR. While we cant take the pain out of your elevation gain we CAN put you on the trail with the new Cosmic Synthetic Sleeping Bag. Its a fully equipped mummy bag thats light on weight and your wallet. The Cosmic synthetic is a three-season superstar built with our new CirroLoft synthetic insulation for lightweight compressible warmth. Soft-as-silk nylon taffeta fabric means youll be thinking less about weary hiker feet and daydreaming about more QT in the outdoors.