Exceloft synthetic insulation and unique stretch construction make the MontBell Super Stretch Burrow 1 15 Degree Sleeping Bag ideal for long backpacking or climbing trips in wet and cold conditions. Tend to change position frequently at night? This synthetic sleeping bags stretch seams accommodate changes in position and provide a thermally efficient, body-hugging fit. MontBell included a neck baffle and draft tube in this three-season sleeping bag to seal in precious body heat. Shorter users can close the last baffle, further reducing the amount of empty space to heat.