Triple Sleeping Bag Technical Details
The WARMLITE® TRIPLE DOWN SLEEPING BAG is the only complete backpacking “BED” for ALL temperature ranges, providing comfort in all conditions anywhere.
Warmlite® Triple Bags have THREE overlapping temperature ranges from +60° to -60°F (-75°F to -80°F reported by hardy Alaskans). And an optional net top that can extend its uses to the tropics.
A Warmlite® Triple Bag gives best COMFORT, warmth, adjustability, and least weight through superior design, fabrication, and efficient use of the best materials. Multiple tops for all conditions, and a comfortable, insulating mat, block ALL types of heat loss, convection, conduction, evaporation and radiation. Our unique designs which allow for the lightest, warmest, four-season sleeping bags with vapor barrier linings have been exclusive to Warmlite® since they were designed in 1959.
INSULATION:
CONVECTION HEAT LOSS is blocked by wind-tight, rip-stop nylon, double zippers (since 1957), closely fitted collar and fully adjustable hood (since 1958). Air can’t enter to carry away heat unless you adjust it to allow it.
CONDUCTION HEAT LOSS is blocked by highest loft 820-890 Goose Down which is held in a very uniform thickness that is not affected by your position in the bag. The bag is designed to provide the most surface area for a nights rest as close to a bed as you can obtain while backpacking. Be sure to follow our girth measuring instructions to select a bag size that will offer you the most comfort. 3″ to 4″ less girth gives less weight but also restricts motion, like a mummy bag, so be sure to take your comfort into account. A mummy bag may make people with claustrophobia uncomfortable.
EVAPORATION HEAT LOSS is blocked by our flannel like vapor barrier fabric lining. With collars snugly closed you can get up to 15°F more warmth from the vapor barrier liner. Opening the collar allows humidity and heat to escapes, removing the extra warmth. For more about vapor barrier materials read Warmlite.com/vapor-barrier/ . We’ve used vapor barrier clothing since 1955 and all Warmlite® bags have had vapor barrier lining since 1968, an essential part of our sleeping bags.
OTHER VAPOR BARRIER GAINS:
Insulation always STAYS DRY. Sweat & humidity from you can’t wet it. All bags without vapor barrier lining absorb water every night from user, due to user’s sweat wicking and condensing in the insulation.
Vapor barrier helps you detect overheating quickly. You’ll open the bag to cool you when sweating begins, not after the bag is soaked with sweat, oil, and salt. The vapor barrier lining also dries before you’ve cooled down, it doesn’t need hours of drying the next day. This is also far less dehydrating, thus you’re less likely to get frost bite the next day.
It’s easy to clean with a damp cloth.
DOWN FILLED AIR MATTERESS:
Size 56”, 60”, 64” and 70” on DAM Refers to the girth size of the sleeping bag it fits into.
Heat loss to ground is blocked with a 3″ to 4″ thick, full size 1 and 1/2 pound Goose Down filled Air Mattress (used since 1975), for the soft comfort & light weight of an air-mat (which are usually cold), and WARMTH of Goose Down (in other bags Down is destroyed by lying on it). Using the DAM saves the user from the bulk and weight of covered foam pads (or even heavier ‘self inflating’ foam cored air-mats.) We also offer +1 pound, 2″ thick foam pad (used since 1966) in place of a DAM (which is still lighter and more compact than ‘self inflating’ foam air-mats).
The DAM slides into a pocket inside the Triple Down Sleeping Bag, they can be stored together while on a trip. With pad locked inside the bag you won’t roll off it, or turn the Down insulation into pieces of string by lying on it. Internal net baffles block the Down from shifting.
We made the first Down filled air-mat in 1959 and learned to produce them in 1975. The fabric is very tough, coated nylon taffeta, the strongest used in any air mats. We use a Radio Frequency Thematron machine to weld the pieces and fabrics together. Since its production, its performance has exceeded all expectations, with life a expediency of well over 20 years. We use the color orange so that in case of an emergency the DAM can be used to attract attention from Search and Rescue or other hikers. It can also be used for a swim or fishing float or, in a worst case scenario, will float you and your bag if the creek rises and floods camp. It inflates fast and easy with the carry sack used as a pump (never by mouth) or with the Microburst inflators.
RADIANT HEAT:
RADIANT HEAT is greatly reduced when inside a tent or under heavy foliage. The silicone coated nylon used on our tents and footprints is a standard on our tents and will protect the user from radiant heat loss and condensation.
LOTS OF FOOT SPACE:
After trying about every possible foot end design, we found that the simple extended foot space was best, allowing your feet to relax in a normal position no matter how you sleep in the bag. Other ‘contoured’ or fitted foot ends all restrict foot spread and are uncomfortable for sleeping on your side or stomach.
ZIPPERS:

