New for 2015! The Sierra Designs Backcountry Bed SYN 1.5 Season zipperless sleeping bag provides similar comfort to your bed at home whether you are a back, side, or stomach sleeper. Synthetic insulation delivers reliable, cost-effective performance. The Backcountry Bed SYN 1.5 Season’s synthetic insulation dries much faster than down and provides warmth even when wet. This is particularly important if you'll be backpacking or camping in wet weather or humid climates. The bag’s polyester ripstop fabric has a surface treatment that further helps to repel water.