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Backpacker Magazine – Online Exclusive
Impress your friends–and understand any salesperson–by learning all sorts of sleeping bag lingo.
A lightly-insulated sleeping bag with an extra-roomy cut that's used to boost your bag's temperature rating by 15-20 degrees F. It can also serve on its own as a lightweight summer bag.Pile/fleece
The same stuff used for jackets is found in some ultralight warm-weather sleepers.Polarguard
More durable than the short-staple synthetic fills, these synthetics have long, continuous-filament fibers that make them more durable, but also heavier and bulkier. Polarguard 3D is the best, and most expensive, of these fills.Polarguard Delta
The latest, greatest version of Polarguard 3D, using a slightly different polymer design, a higher-denier fiber, a bigger void inside the fiber, and thinner walls. What's it all mean? You get a bag that's 10 percent warmer and slightly lighter, with better loft and durability.Quallofil
This synthetic insulation will perform similarly to others, but is heavier and bulkier than newer versions, which is why it typically is found in less expensive bags.