Backside Ice X-Fiber -30 Degree Mummy Sleeping Bag (Light Blue/Black) 100% Polyester Imported This X Fiber sleeping bag is ideal for a winter backpacking trip with a lightweight design and a comfort rating good to -30 below zero you can stay comfortable and warm in the nastiest conditions Diamond rip stop nylon outer shell offers great water resistance and durable light weight protection, with YKK zippers and oversized draft tubes to keep the cold out and the warmth in Our bags are sewn with a two layer off set construction so that the seams dont overlap causing cold spots where there is no insulation our bags run consistent insulation from head to toe Our X fiber synthetic fill in these bags is ultralight and long lasting sewn into place to protect against cold spots and the best insulation in wet conditions able to keep you warm even when wet. Measures 94 inches long 35 inches wide at the shoulder and 15 inches wide at the foot with a box foot construction