Trek Tk III is a comfortable and versatile sleeping bag with a classic rectangular tapered cut. Vertical chambers in the chest area ensure that the feathers cannot slide to the sides during sleep and create cold spots. The chamber construction with side baffles maintains the fill ratio and leaves more down in the top of the sleeping bag for maximum insulation. The materials used reduce the weight and volume of the packed sleeping bag, and the two-way full-length YKK side zipper and separate foot zipper allow the sleeping bag to be fully opened and used as a blanket. A zipper in the foot area provides extra ventilation and allows the legs to move freely. The 3D chamber construction with a side baffle ensures that the down can reach its maximum loft, reaching the very edge of the sleeping bag, maximizing insulation. The padded hood can be pulled tight when needed and can be flattened in warmer weather. The zipper is covered from the inside with a large flap that prevents heat loss around the zipper. The leg is made of a material that ensures smooth fastening and unfastening without catching the zipper. The inner material is made of highly breathable fabric that is resistant to feather penetration. Complementing the thoughtful design features of this classic sleeping bag, the sleeping bag features a large internal security pocket that’s perfect for your valuables, phone and various batteries.