Mummy sleeping bags get the name because of the shape. Mummy bags are taper from the top of the bag to the bottom. It helps improve overall heat of the sleeping bag. The taper shape helps the feet to keep warm where your body will loose a lot of heat. Another thing is a drawstring at the top of the bag to help to keep the warm air in the sleeping bag.  

Acme Sleeping bags is here to bring you high quality of mummy elite sleeping bags. We bring you brands like Coleman,Sumberjack, High Peak,Eureka and many other of the top manufacturer of sleeping bags.We carry the camper Sleeping bag Lattitude 0 F long,Casper women's long, Chinook Aaskan 8 -40F, Chinook microloft 23F mummy,Chinook Thermopalm mummy 50F,Eagle Point long and regular, Eureka Casper long and regular,Eureka Copper River long and regular,Eureka Silver City regular and long,Eureka Silver City women's long, the backside 800 series +20 premium down bag,the  backside HM +20 Blueice mummy bag and the Wild Basin regular. So when you are shopping for a sleeping bag look at acmesleepingbags.