Nanga built their reputation on developing sleeping bags designed to perform in some of the most extreme climates on Earth, so it's no surprise to learn that even their entry-level models, like this ZZZ 10, are replete with functional materials and details. This is a two-season bag designed to perform from early spring to late summer, and has been constructed from a lightweight 20d nylon ripstop with NATURALOFT® synthetic insulation - the first synthetic insulation the brand has ever used - which will perform even if damp.