Mountainsmith Cotton Sleeping Bag Liner

The forecast is calling for colder lows than you expected, but don't worry, there's no need to buy a whole new sleeping bag over a few degrees difference. Just slide the Mountainsmith Cotton Sleeping Bag liner into your sleeping bag to increase warmth a few degrees without adding a ton of bulk or weight to your pack, and it also extends the life of your bag by protecting it from sweat and oils.