When the weather gets frigid and the forecast looks damp, the Therm-a-Rest Saros 0-Degree Synthetic Mummy Sleeping Bag is equipped to keep campers and backpackers resting better. The Saros uses Therm-a-Rest's EraLoft synthetic insulation, which is quick-drying and weather resistant, making it ideal for backpacking and mountaineering in wet weather from spring to fall. The fit of the bag has been perfected in Therm-a-Rest's onsite cold chamber to create a W.A.R.M. fit that allows room for multiple sleep positions without compromising thermal efficiency. The SynergyLink Connectors also integrate the Saros with a pad to ensure superior comfort with efficient warmth and the freedom to move for the best night's rest possible. The Saros 0F/-18C is designed to fit both men and women and available in three sizes: Small measures 73x29x5.5 inches, fits heights up to 5 foot 6 inches, packs to 11x12 inches, and weighs 4.31 pounds; Regular measures 80x31.5x5.5 inches, fits heights up to 6 feet, packs to 11x12 inches, and weighs 4.94 pounds; Long measures 85x33x5.5 inches, fits heights up to 6 feet 6 inches, packs to 11x12 inches, and weighs 5.25 pounds. Storage sack and compression sack included. Manufacturer's limited lifetime warranty.