Rab Atlas 750 Sleeping Bag:The Atlas 750 is designed to meet the needs of the year round walker and trekker who demands a warm and lightweight sleeping bag that will withstand the winter chill.The Rab sleeping bag is made from Pertex® Microlight, a water resistant and breathable fabric that holds off the water.The wicking polyester inner means that you stay dry and comfortable while the duck down keeps you warm and body temperature high.The Lowdown: This is a comfortable, warm and durable bag for all but the most extreme conditions.