Tri-Layer Down Filled Sleeping Bag / -60F Degrees

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Triple Layer Down Filled Sleeping Bag

-60 Degree, down-filled, 4-season sleeping bag

The WARMLITE TRIPLE SLEEPING BAG is the only complete backpacking “bed” for ALL temperature ranges, providing comfort in all conditions, anywhere in the world.

Warmlite Down Filled Tri-Layered Sleeping Bags have THREE overlapping temperature ranges from -60° to +60°F (-75°F to -80°F reported by hardy Alaskans). An optional net top extends use to the tropics or insect prone areas. Making this a true 4-season Sleeping Bag.

A Warmlite Down Sleeping Bag has three layers that can be zipped on or off depending on the climate and conditions you will be facing. This bag gives the best comfort, warmth, adjustability, with least weight, through superior design, fabrication, and the most efficient use of materials.

INSULATION: This Sleeping Bag block all types of heat loss
  • CONVECTION: Heat Loss is blocked by air-tight ripstop nylon, overlapping zipper layers, closely fitted collar and a fully adjustable hood. Air can’t enter the bag to carry away heat unless you adjust it to.
  • CONDUCTION: Heat Loss is blocked by the highest loft 820-890 Goose Down available, held in a very uniform thickness that is not affected by your position in the bag. The bag is shaped for least surface area without compromising on comfort. Follow our girth measuring instructions to select a bag for best comfort. 3″ to 4″ less girth gives less weight but restricts motion, like a mummy bag, less girth isn’t practical for everyone.
  • EVAPORATION: Heat Loss is blocked by flannel-like soft Vapor Barrier fabric on the bottom layer and collars, and your choice of Vapor Barrier fabric on the interior of the top layers. With collars snugly closed you get up to 15° more warmth from the Vapor Barrier layer. Open the collars and humidity escapes, removing the extra warmth. Vapor Barrier aids temperature control by giving extra warmth only when needed. We’ve used Vapor Barrier since 1955, and all Stephenson bags have had Vapor Barrier since 1968, a major reason for enthusiasm of users. The Vapor Barrier is as “breathable” as Gore Tex (as defined by their level of humidity transfer), and thus an excellent vapor barrier for this use.
Other Vapor Barrier gains:

Insulation always STAYS DRY. Meaning, the down in the sleeping bag that is keeping you warm will never become saturated in sweat. All bags without Vapor Barrier lining will get wet every night from inside, due to user’s sweat wicking away from their body and then condensing in the insulation.

Vapor Barrier helps you detect overheating quickly. You’ll open the bag to cool you immediately, not after the bag is soaked with damaging sweat, oil, and salt. The bag dries even before you’ve cooled down and doesn’t need hours of drying the next day.

It’s easy to clean with a wipe of a damp cloth.

Much less sweat is lost, thus you’re less likely to dehydrate or get frost bite the next day.

(Size 56”,60”,64” and 70” on DAM Refers to the girth size of sleeping bag it fits into)

Heat loss to ground is blocked with a 3″ to 4″ thick, full size 1 1/2 lb. Goose Down filled Air Mat (used since 1975), for the soft comfort and light weight of an airmat (which is usually cold), and warmth of Goose Down (in other bags Down is destroyed by lying ON it): no bulk and weight of covered foam pads (or those heavier “self inflating” foam cored air mats.) For less cost +1 lb. & much more bulk get the 2″ thick foam pad option (used since 1966), still lighter and more compact than “self inflating” foam air mats.

Our Triple Down Sleeping bags have a built in compartment to place a DAM or foam mat. With the pad locked to the bag you won’t roll off, or turn your insulation into pieces of cold non-insulating string by lying on it. The wider foam pad to fit in DAM space is ½ lb. heavier than normal foam pad and will need a larger carry sack.

We made the first Down filled airmat in 1959, learned to produce them in 1975. Net baffles block Down shift. Fabric is tough, heat sealed, coated nylon taffeta, the strongest used in any air mats. Performance exceeds all expectations, with lifespans of over 20 years. Color is orange for emergency use to attract attention. It can be used for a swim or fishing float or, will float the bag if the creek rises and floods your camp. It inflates fast with the carry sack used as a pump or the Camp-Tek Microburst Pump (never inflate by mouth).

RADIANT Heat is greatly reduced when inside a tent or under heavy foliage. The silicone coated nylon used on our tents is a great vapor barrier and is a standard on our tents.

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 slept in the bag. Other “contoured” or fitted foot ends restrict foot spread and are uncomfortable for sleeping on your side or stomach. You can also put water bottles or boots in the bottom of the bag to keep them warm until the next day. The extended length of the bag allows you to do this without these items interfering with your foot space and sleeping comfort.

Even at the zippers there is no insulation loss. Parallel zippers separately close inner and outer surfaces. Separating zips on each side, and across the foot give independent venting and let you zip bags together on EITHER side, or join the tops together for a very wide warmth adjusting top. Use tops zipped together for a quilt on your cabin bed. In very cold conditions, to dress INSIDE or for fine tuning from -50° to +10°, using both tops, unzip tops on opposite sides to let the bag expand as needed.

In 1987 we switched to the excellent YKK zippers for bags, for least weight and least snags. Experience with these on bags since 1987 has been as flawless as on the tents since 1970. Heavy zips used by others snag fabric which spreads the slider and makes zipper come apart.

FULLY Adjustable HOOD

The unique Warmlite hood design evolved as a way to permit full head protection when sleeping in any position. Most hoods can only be closed if you lie on your back. Our hood zips up over the shoulders and snug up over or around the head with the top drawstring, so it can close snugly around your face or nose when you’re on your back, or adjusts to cover your head and leave breathing space when lying on your side or stomach.

For safety we use non-lock zip sliders; if you wake with your head in the bag, a good push will open the hood. Velcro tabs across the zippers at two positions take more than usual force to pass, so they won’t drift open. You can add tabs for more positions if desired.

Optional Net Top

For use in tropical areas, check out the Net Top option for sleeping bags.

Cost Comparison

The cost of a Warmlite bag may seem high, but consider how much it includes. Compare it to other bag combinations needed to match it, you would need a winter bag, a summer bag, an overbag, a Vapor Barrier liner, plus 4 lbs. of two self inflating pads to match the warmth and comfort of a D.A.M. Separately purchasing all these items would add up to a substantially steep cost, weight, and bulk not to mention closet space required for storage between trips. We give you more for by avoiding duplication of materials, low overhead, and no third party sales markup.

Many people don’t need extreme low temperature capability of a full TRIPLE bag, but want something for 3 season use where it might range from 10° to 65° F. The Warmlite Triple is ideal for that use, while no other single bag can cover such a wide range. The thin top covers 25° to 65° range, the THICK top -10° to 45° range, and the combination gives quick warm ups (and warmth enough for surprise emergencies down to -60° F. for average person.) Why buy 2 or 3 other bags to cover the range, not know which to take, or worse, find you’ve taken the wrong one, when one Warmlite bag does it all?

How to Wash

Sizes & Weight

Size 56″, 60”,64” and 70” on DAM Refers to the girth size of sleeping bag it fits into.

Girth Height Range Length Weight Range
56″ 5′ – 5’8″ 66-70″ 90-120 lbs
60″ 5’4″ – 5’10” 70-74″ 105-155 lbs
64″ 5’8″ – 6’4″ 78-82″ 130-190 lbs
70″ 5’10” – 7′ 84-88″ 170-250 lbs

Note: Lengths will vary due to DAM fullness, overall person size, and custom hand sewing variations by 1/2″

Typical weights for each layer in ounces: (excluding Pad)

56″ 16 26 29 71
60″ 17 28 30.5 75.5
64″ 18 30 32 80
70″ 20 33 34 87

Weight of D.A.M and Optional Foam Pad and Total Weights of Bag System with Either On:

Girth Down-Filled
Air Mattress
Sleeping Bag with Down-Filled
Air Mattress
Foam Pad Foam Pad
with Sleeping Bag
56″ 20 oz 91 (5 lb 11 oz) 28 oz 99 (6 lb 3 oz)
60″ 21 oz 97.7 (6 lb 1.5 oz) 30 oz 105.5 (6 lb 9.5 oz)
64″ 24 oz 103 (6 lb 7 oz) 32 oz 112 (7 lb)
70″ 28 oz 112 (7 lb) 36 oz 123 (7 lb 11 oz)

How to Measure Girth

Note: Layers are filled for given LOFT, not weight, thus when Down loft is better these weights will be less, and vice versa. Decrease in height reduces weight about 1 oz. per inch.

Bag Packed Sizes

WITH Down Air Mattress:
10″ x 27″

WITH Foam Pad:
11″ x 27″



Silicone coated nylon is standard for best Vapor Barrier, least weight, best durability, and many colors. For $50 extra you can have rip-stop silicone fabric on interior top.

The bottom interior is Fuzzy Stuff, a very comfortable brushed knit Nylon plus tough stretchy urethane film. It wears much better than coated fabric, is best for comfortable long life sleeping bag inside bottom, Vapor Barrier socks, glove liners and clothes. The surface feels like soft flannel, but wicks sweat across it’s surface even faster for rapid drying and comfort. It’s worked great for our boat cushions in BVI since 1990. Fuzzy Stuff is so comfortable against your skin you won’t want or need to wear anything under it.

Fuzzy Stuff is used on the bag bottom interior where comfort, extra wear resistance, wickability for fast drying, and easy cleaning is most needed. It is not standard on tops and it clings slightly to clothing, weighs more, and the extra toughness isn’t needed on tops. Colors vary: we try to pick compatible interior colors. Send stamped addressed envelope for samples.


Fabric is the finest 30 denier Down proof ripstop nylon with a soft, water repellent finish. Used since 1958 without failure, it’s obviously TOO durable, but there’s no lighter Down proof fabric! Every part is cut using a hot knife fabric cutter, the best way to keep edges from fraying and reduces weight of hemming. All others hide raw knife cut edges with binding tape or flat felled seams, but that won’t keep them from soon pulling apart. Usual colors are red, blue, or green, others can be used for special orders.

Each bag is individually sewn by a highly skilled seamstress working from home. The highest loft most mature Goose Down available is carefully HAND weighted into each pocket, in a sequence that assures designed uniform loft.

Contoured direct tension vertical baffles, closely spaced, maintain uniform loft no matter how you move in the bag, yet allow CONTROL of insulation: if too warm, pat and force the Down out to sides to thin the center. If cold, gently pat from inside, expanding Down to fill tubes for more warmth.

All sewing is with 100% Nylon thread to match fabric strength, stretch, softness and super wear resistance.

Comfort Ranges

The standard Warmlite Triple includes both the THIN (1.8″ thickness= 3.6″ “loft”) and THICK (3.8″ thickness= 7.6″ “loft”) removable tops (equivalent to 11.2″ loft combined), attached with parallel rows of separating zippers along each side and across the foot, so there can be no cold zipper line when THICK or BOTH tops are used. Usually the THIN top is used down to 25° (summer range), the THICK top down to -10°, and the combination for quick warm up, or winter use down to -60° F. (- 75 to -80 reported by hardy Alaskans!)
Comfort ranges are greater than for any other bag of similar thickness due to controllable warmth and capture of moisture by vapor barrier. Uniform thickness and dual zips let you move as you wish while staying warm, so you won’t get stiff and sore from staying in one position all night. If you’ve experienced cold nights in bags with separate pads, you know how any attempt to roll over makes you COLD when crushed insulation below is exposed: you soon learn “don’t move” then wake up stiff & sore.

For use outside a good shelter, spray on water repellent recently applied is best for dew or drip protection. Bags without Vapor Barrier always get wet from the inside due to users humidity condensing in the insulation, even with no outer cover. Any material (“breathable” or not) laid over any sleeping bag greatly increases condensation even with Vapor Barrier. Don’t put any waterproof cover or bivy sack over any bag you want to keep dry!

A thin, plastic drop cloth or a Warmlite Footprint works best for ground protection, plus gives an area for your pack, boots and other gear.

For tropics, warmer climates, or insect prone areas use the optional Net Top, a double layer of fine no-see-um net held 3/4″ apart with foam spacers. Bugs on outer layer can’t reach through to you.

Custom Orders

When we made all tops removable on TRIPLE bags in 1970, purchases of our single top bags dwindled to nothing, so we stopped listing them (but every 2 or 3 years someone requests a special single top bag, which we make for him or her). All other bags sold are still only for single condition use and need another whole bag to extend range. People buy limited use single top bags to save money, but when another bag is needed for other conditions, the cost doubles. Weather is not predictable. A non adjustable bag can leave you dangerously cold or miserably sweaty. With a Warmlite Triple you get best materials and features, and the effect of 3 bags and a pad with complete weight of only 1 and 1/4 bags. In any form it’s lighter, more compact than any other equivalent single bag and pad. Leave thick top home, save 2+ lbs. Leave thin top, save 1+ lb.

We’ll custom make thinner lighter Triples and special Single top bags if needed, but expect alternate suggestions from us if our experience indicates your stated needs will be better met with something different. We rather have you happy for many YEARS from now, not just pleased with us before you get it!

Warmlite bags are stocked (when we can) in 4 girths with “standard” heights, in red, blue or green. We will make them to order for ANY height, ANY girth, ANY colors we can get (or combinations) as requested. When ordering give us your height, weight, girth measurement (see measuring sketch), desired bag girth (and why if different from measurement), whether you’ll take standard height bags for that girth or want it custom made to your height (to save 1 oz./inch), type of bottom pad (D.A.M. or Foam), and color choice(s). If rushed, call to check stock. Production may take 4 to 12 weeks.


The WARMLITE TRIPLE SLEEPING BAG is the only complete backpacking “bed” for ALL temperature ranges, providing comfort in all conditions, anywhere in the world.