The KingCamp Sleeping Bag offers superb value with its toasty warmth and widened shape. Its affordable price point sure doesn't hurt either, leaving plenty of extra loot for far-flung trips into the mountains. 100% polyester 210T diamond lattice fabric insulation traps thermal warmth with its lightweight Hollow Cotton Filling, ensuring we're sleeping soundly when the mercury plunges on crisp, clear evenings. We can also use a zipper to link two single sleeping bags to become a double sleeping bag, more choice for us.