Western Mountaineering Microfiber Series at BackcountryGear.com
More durable than the ExtremeLite bags and more breathable than their Windstopper series, the Microfiber bags offer a nice balance for a wide variety of conditions.
The Microfiber (MF) series is the perfect blend of lightweight yet highly water resistant fabrics and advanced construction techniques. The MicroLite XP shell is densely woven from ultra fine yarns creating a naturally weather resistant barrier that won't wear off or wash out, and can't delaminate.
It's the perfect shell material for most conditions, and the MF series covers a wide range of temperatures from 35F to -25F. After the first night you'll wonder how you went so long without one!