The Selk’bag 4G classic synthetic sleeping bag is perfect for people who feel restricted by traditional sleeping bags or for a cozy alternative to wrapping up in a blanket around camp. the Selk’bag Sleepwear System is now offered in a new Lite version that is 30% lower in weight than Selk’bag 3G. Selk’bag 4G classic synthetic sleeping bag is designed as the perfect two-season sleepwear system. It is rated to 45 degrees Fahrenheit. Perfect for a variety of adventures, the Selk’bag is used by outdoor enthusiasts the world over for camping in a tent, under the stars, at the lake, at the beach or even in the cabin.