The JUNGLEBOA sleeping bags are made with Elevation Insulation. 

SPECS

Elevation insulation
Two-layer offset construction
Multiple sizes and temperatures
150D Oxford ripstop waterproof outer fabric ; Soft Breathable 190T Polyester Pongee Liner
Filling: Soft cotton flannel with SuperLoft Elite hollow Cotton fiber insulation for warmth
Double-layer construction entire width and length of bag increases warmth and durability
Product Weight approximately: 2.28lbs )
Product Dimensions: 210 x 100 CM (83 x 39 inches)
Limited temperature approximately :-5℃ ~ 5℃

Features:

Type: 3-season sleeping bag for winter and autumn, spring
Outdoor Sleeping Bag, Water-resistant/Windproof/Warm/Cold-resistant
Lightweight and breathable, Super soft and warm
Portable, convenient to carry
 Stop the wind and keep warm at night
Suitable for camping, hiking, walking, travelling, trekking and any other outdoor sports . The JUNGLEBOA is a great backpacking sleeping bag to take along on your hikes that won't take up all the space in your pack. The sleeping bag uses a 2-layer offset construction, sometimes called a "bag within a bag