How much warmth does this liner actually add to a sleeping bag?

Hollow-core fibers trap air for insulation, which can extend a bag's usable temperature range by several degrees. The exact gain depends on your bag's construction and how you sleep, but many users find it turns a summer bag into a three-season option or makes a cold night in a marginal bag more comfortable.

Can I wash this liner, or will that remove the odor treatment?

You can wash it. The silver-ion treatment is permanent and survives repeated laundering. The point of the treatment is to reduce how often you need to wash it in the first place, which keeps both the liner and your sleeping bag in better condition over time.

Does this liner work with sleeping bags from other brands?

Yes, though it's patterned to match NEMO's Spoon shape for the most efficient fit. It will function inside any sleeping bag, but traditional mummy or rectangular bags may not align as precisely with the contours, which can lead to some shifting overnight.

How do I recycle this at the end of its life?

Send it back to NEMO through their Endless Promise program. Because the liner is made from a single material type throughout, they can process it for full recycling rather than separating components or sending it to a landfill.

Tracer™ Blaze Endless Promise® Sleeping Bag Liner

#2 in Outdoors

Recycled materials

The 3-second version

Hollow-core recycled fibers trap heat without adding weight
Silver-ion treatment stops bacteria growth and extends time between washes
Shaped to fit NEMO Spoon bags without twisting or bunching
Best fit for NEMO Spoon bags
Adds warmth but not a winter solution
Requires mail-back for recycling

Why it's on GiftsFeed

Sleeping Bag Liner That Adds Warmth and Keeps Your Bag Fresh Longer

Most liners are afterthoughts: slippery nylon sacks that bunch up by midnight or cotton bags that add weight without warmth. This one uses the same hollow-fiber engineering found in technical insulation, so you actually feel the temperature difference instead of just adding a barrier layer.

The silver treatment is the practical win. Washing a sleeping bag is a multi-hour ordeal that compresses loft and wears out water-resistant coatings. By catching sweat and skin oils first, the liner stretches the interval between washes from a few trips to an entire season. Worth it if you camp more than twice a summer.

Good gift when

Backpackers who want to lighten their load by carrying one bag across seasons
People who camp frequently and want to reduce how often they wash their sleeping bag
Warm-weather campers looking for an ultralight alternative to a full bag

Skip it if Designed primarily for NEMO Spoon-shaped bags; fit may be less precise in traditional mummy or rectangular sleeping bags

Specs

Material: THERMOLITE EcoMade fabric (100% recycled yarns)
Treatment: FUZE silver-ion odor and bacteria inhibitor
Construction: Hollow-core fibers
Shape: Contoured to fit NEMO Ultralight Spoon bags
Hardware: None
Recyclability: Fully recyclable via NEMO Endless Promise program
Sizes: Regular, Long

What's included

Sleeping bag liner

If you're giving it

You'll need their size

Available in Regular and Long; buyer should know recipient's height for best fit.

The details

Sliding into a sleeping bag that smells like last month's adventure is nobody's idea of comfort. This liner solves two problems at once: it adds warmth when temperatures drop and keeps your bag cleaner by catching body oils and dirt before they reach the insulation.

The fabric comes from recycled yarns spun with hollow cores that trap air for insulation without bulk. You get real warmth gain—enough to push a three-season bag into shoulder-season territory—in a package that weighs less than a water bottle. The silver-ion treatment works continuously to stop bacteria from multiplying, which means fewer trips to the laundromat and less wear on your bag's delicate shell and fill.

Shaped to follow NEMO's Ultralight Spoon contours, the liner stays put instead of twisting into a rope by morning. No zippers, no drawcords, no hardware to snag or fail. When summer heat makes your insulated bag too much, the liner works alone as a sleep system that packs smaller than a paperback.

At end of life, send it back. Because the entire liner is made from a single material type, NEMO can recycle it completely rather than sending it to a landfill. No sorting, no separation, no excuses.

NEMO Equipment

Tracer™ Blaze Endless Promise® Sleeping Bag Liner

Recycled hollow-fiber construction traps heat while silver-ion treatment fights odor between washes

$89.95at nemoequipment.com

Choose an option

Quantity

Buy from NEMO Equipment

Ships and sold by NEMO Equipment. About this merchant

The 3-second version

Hollow-core recycled fibers trap heat without adding weight
Silver-ion treatment stops bacteria growth and extends time between washes
Shaped to fit NEMO Spoon bags without twisting or bunching
Best fit for NEMO Spoon bags
Adds warmth but not a winter solution
Requires mail-back for recycling

Cheaper alternatives

Clear Waterproof Pack Liners$7.50

Questions

How much warmth does this liner actually add to a sleeping bag?: Hollow-core fibers trap air for insulation, which can extend a bag's usable temperature range by several degrees. The exact gain depends on your bag's construction and how you sleep, but many users find it turns a summer bag into a three-season option or makes a cold night in a marginal bag more comfortable.
Can I wash this liner, or will that remove the odor treatment?: You can wash it. The silver-ion treatment is permanent and survives repeated laundering. The point of the treatment is to reduce how often you need to wash it in the first place, which keeps both the liner and your sleeping bag in better condition over time.
Does this liner work with sleeping bags from other brands?: Yes, though it's patterned to match NEMO's Spoon shape for the most efficient fit. It will function inside any sleeping bag, but traditional mummy or rectangular bags may not align as precisely with the contours, which can lead to some shifting overnight.
How do I recycle this at the end of its life?: Send it back to NEMO through their Endless Promise program. Because the liner is made from a single material type throughout, they can process it for full recycling rather than separating components or sending it to a landfill.