Tracer™ Endless Promise® Sleeping Bag Liner
- Recycled materials
The 3-second version
- Hollow-core fiber traps heat in air pockets for genuine warmth boost
- Antimicrobial silver treatment stops odor-causing bacteria permanently
- Shaped to fit mummy bag contours without bunching or excess fabric
- Adds warmth but won't replace a colder-rated bag
- Shaped for mummy bags, may not fit rectangular bags well
Why it's on GiftsFeed
A sleeping bag liner that adds degrees, fights odor, and returns for recycling
Most liners are afterthoughts—a sheet of slippery nylon that slides around inside your bag and adds maybe five degrees if you're lucky. This one uses hollow-core fiber, the same principle that makes down warm: air trapped in tiny chambers insulates better than solid material. That construction actually changes how cold a night you can handle, not just how your bag feels. The antimicrobial treatment is permanent and chemical-free, so it keeps working through years of use and dozens of washes. If you're serious about a sleep system that adapts across seasons rather than owning three bags, the difference is in the fiber structure.
Good gift when
- Backpackers stretching three-season bags into spring and fall
- Ultralight campers who sleep warm and want a summer-only option
- People who rarely wash their sleeping bags due to down or loft concerns
- Travelers bunking in hostels or huts with questionable bedding
Skip it if If you sleep cold even in a rated bag or camp regularly below freezing, a liner won't replace the insulation you actually need. This adds degrees, but it's not a substitute for a warmer bag when conditions demand one.
Specs
- Material
- THERMOLITE EcoMade fabric, 100% recycled yarn with hollow core fibers
- Treatment
- FUZE non-ionic silver antimicrobial
- Shape
- Contoured to fit mummy-style sleeping bags
- Hardware
- None
- Recyclability
- Fully recyclable through manufacturer take-back program
- Available Sizes
- Regular, Long
What's included
- Tracer sleeping bag liner
If you're giving it
- You'll need their size
Available in Regular and Long sizes to match sleeping bag length.
The details
Most sleeping bag liners are a damp compromise—too thin to add real warmth, too clammy to sleep in alone. This one uses hollow-core fiber construction that traps body heat in air pockets while wicking moisture away from skin. The result is a liner that genuinely extends your bag's temperature rating and feels comfortable enough to use as a standalone sleep system when overnight lows stay mild.
The fabric receives a permanent antimicrobial treatment using non-ionic silver, which stops bacteria from multiplying and causing odor. That means your sleeping bag interior stays cleaner longer, reducing how often you need to launder the whole system. Fewer washes preserve loft in down or synthetic insulation and cut down on microplastic release into wastewater.
Shaped to follow the contours of a mummy bag without excess fabric bunching at your feet or shoulders, the liner stays in place overnight. No drawcords, toggles, or zippers to snag or dig into you—just a clean envelope of fabric that slides into your bag and disappears.
When the liner reaches the end of its useful life, send it back to the manufacturer. Because it's constructed from a single material type throughout, the entire piece can be broken down and spun into new fabric rather than ending up in a landfill. You get a confirmation that it entered the recycling stream, not a vague instruction to check with your local facility.
The construction relies entirely on recycled yarn, woven into a textile that delivers more warmth per ounce than solid-core alternatives. Whether you're pushing your three-season bag into shoulder season or packing light for a summer fastpack, the liner adds capability without the weight penalty of carrying a warmer bag year-round.
Hollow-core recycled fiber traps heat while antimicrobial treatment keeps it fresh between washes
Ships and sold by NEMO Equipment. About this merchant
Cheaper alternatives
Questions
- How much warmth does this liner actually add to a sleeping bag?
- The hollow-core fiber construction traps body heat in air pockets, which can extend your bag's comfort rating by several degrees. The exact amount varies based on your sleeping bag's insulation type, your metabolism, and conditions, but the fiber structure provides measurably more warmth than standard solid-fiber liners.
- Can I use this liner by itself without a sleeping bag?
- Yes. When overnight temperatures stay warm—typically above fifty degrees Fahrenheit—the liner works as a standalone sleep layer. It's lightweight and compact enough for summer backpacking, hostel stays, or camping in mild climates where a full sleeping bag would be too much.
- Will the antimicrobial treatment wash out over time?
- No. The non-ionic silver treatment is permanent and bonded to the fiber, so it continues working through the life of the liner even after repeated washing. This is different from spray-on or chemical treatments that degrade with laundering.
- How does the recycling program work when the liner wears out?
- Because the liner is made from a single material type throughout, you can send it back to NEMO at end of life. They process it through their recycling stream, breaking it down to be spun into new fabric rather than sending it to a landfill.
- Does this liner work with rectangular sleeping bags?
- It's shaped to follow the contours of mummy-style bags, so it may have excess fabric or not fit as snugly in a rectangular bag. The best fit and performance come when paired with a tapered or semi-rectangular bag design.
- How often do I need to wash this compared to washing my sleeping bag?
- The antimicrobial treatment inhibits bacteria growth and odor, so the liner stays fresh longer between washes. This means you can reduce how often you launder your sleeping bag itself, which helps preserve insulation loft and reduces microplastic shedding into wastewater.
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