The Western Mountaineering Apache MF 15 Degree Sleeping Bag is a weather resistant sleeping bag for two to three season warmth. Rated down to 15°F, you can take off in spring and not return until fall. The mountains are yours to explore by foot. Come nightfall, the 850+ fill power down surrounds your body in a 6" loft so you can dream peacefully away from the cold. The MicroLite XP™ shell is breathable while still weather-resistant, so a rainy night or condensation can't ruin the adventure. At an average of 2lbs in weight, you'll be pleased at the warmth it can provide.