Lofty, warm and light, the KSB 20˚ down sleeping bag is designed for three-season backpacking. The 650 fill power down delivers exceptional warmth for its weight, is easily packed and provides years of use. A draft collar, over-stuffed foot box, insulated mummy hood and flexible baffles at the body’s core all work together to minimize heat loss for greater thermal efficiency. High tenacity fabrics are tough, light and comfortable. The expanded chest area and flexible baffles provide room to move, and a stash pocket keeps small items right at hand. Pair it with one of our Inertia or Static pads for a lightweight, packable backcountry sleep system.