The MicroFiber Series is designed for backpackers, mountaineers and backcountry hunters who want added durability and weather resistance without a major weight penalty. Using our Microlite® XP microfiber shell fabric, these sleeping bags strike an ideal balance between breathability, water resistance, and long-term reliability across a wide range of conditions.

Compared to ultralight shell fabrics, MicroFiber adds a noticeable margin of protection against condensation, damp environments, and repeated use—making it a strong choice for extended trips, variable weather, and users who prioritize longevity. The tightly woven, high-density microfiber construction is highly breathable, down-proof, and naturally water resistant, helping maintain loft and warmth night after night.

If you’re looking for a lightweight down sleeping bag that offers greater toughness and moisture tolerance than our ExtremeLite series—while remaining significantly lighter and more breathable than fully waterproof shells—the MicroFiber Series delivers dependable performance in real-world conditions.