Sleeping Bag Overfill

Sleeping Bag Overfill – Extra Down Insulation for Western Mountaineering Bags Boost your sleeping bag’s performance with the Sleeping Bag Overfill , an optional upgrade that adds extra 850+ fill power ethically sourced goose down throughout your bag’s fully baffled chambers. This custom modification increases warmth by approximately 5°F , making it ideal for colder conditions, high-altitude trips, or anyone who simply prefers a warmer night’s sleep. In addition to the immediate warmth boost, an overfill helps maintain long-term loft retention . Over time, even the highest quality down can lose some loft due to moisture, body oils, and repeated compression. By increasing the amount of down inside, your bag resists these effects longer, preserving its thermal efficiency for years to come....