The Therm-a-Rest Saros 20-Degree Synthetic Mummy Sleeping Bag is the perfect choice for backcountry trips that start with a shaky forecast. The Saros uses 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. 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 20F/-6C is designed to fit both men and women and available in three sizes: Small measures 73x29x4.5 inches, fits heights up to 5 foot 6 inches, packs to 9.5x10.5 inches, and weighs 2.81 pounds; Regular measures 80x31.5x4.5 inches, fits heights up to 6 feet, packs to 9.5x10.5 inches, and weighs 3.19 pounds; Long measures 85x33x4.5 inches, fits heights up to 6 feet 6 inches, packs to 9.5x10.5 inches, and weighs 3.56 pounds. Storage sack and compression sack included. Manufacturer's limited lifetime warranty.