Add +15°F Warmth.
Stop wrestling twisted, zipperless liner tubes at 2:00 AM or shivering against icy nylon.
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Every detail of the Cosari TrailLoft was built to fix the four complaints that ruin overnight trips: cold nylon shock, midnight leg tangling, dirty down bags, and impossible stuff sacks.
High-loft charcoal-gray microfleece traps insulating dead air immediately without static cling, shiny plastic feel, or noisy Mylar crinkling when you shift.
Run the smooth-glide black zipper partway down for easy tent entry, open the footbox to vent heat, or unzip 100% flat for a two-person travel throw.
Folds cleanly over your sleeping bag's stiff top edge so rough zipper garages never scratch your face and body oils never ruin expensive down loft.
Packs down to the size of a 32-oz water bottle (8.5" × 4.5", 17.2 oz) inside a cylindrical black ripstop nylon drawstring sack with a plastic cord-lock toggle.
Zipperless tubes twist 180 degrees every time you roll onto your side. Our full-length black side zipper lets you open the liner wide like a bedsheet, step out in the dark without dragging your bag, and vent warm air on demand.
Washing a down sleeping bag is a four-hour nightmare that risks clumping your insulation. Tuck the TrailLoft inside and drape its 8-inch charcoal fleece cuff over the collar—after the trip, you only wash the liner.
Use it inside your bag on 35°F fall nights, sleep on top of your pad in 75°F summer weather, spread it over questionable cabin or hostel mattresses, then roll it back into its cord-lock nylon cylinder in 35 seconds.
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86" × 31.5" Brushed Charcoal Matte Microfleece Liner with Full-Length Anti-Tangle Side Zipper, 8" Fold-Over Collar Shield & Cord-Lock Ripstop Stuff Sack
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$74.99 $149.99 Free Tracked Shipping (5–7 Days) Included
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Built for Real Sleepers, Not Mannequins: Whether you're car camping in Moab, sleeping in a drafty A-frame cabin, or overlanding in shoulder-season frost, the Cosari TrailLoft ZipLiner bridges the gap between cold nylon gear and home bedding. Its 86" × 31.5" rectangular geometry gives side-sleepers room to bend their knees, while the non-slip matte exterior stays put inside your sleeping bag.
3-in-1 Cold Insert, Summer Sack & Travel Blanket: Closed up, it adds +12°F to +15°F of breathable thermal loft inside any three-season mummy or rectangular sleeping bag. Unzipped along its full-length black side zipper, it opens flat into an 86" × 63" soft charcoal fleece blanket for campfires, road trips, and hotel beds.
Specifications & Included Hardware: Folded dimensions: 86" L × 31.5" W (220 × 80 cm) including 8" fold-over top cuff. Flat blanket dimensions: 86" L × 63" W (220 × 160 cm). Packed dimensions: 8.5" × 4.5" cylindrical ripstop nylon drawstring sack with spring cord-lock toggle. Total weight: 17.2 oz (490 g).
Free 5–7 Day US Shipping: Every order ships free with full tracking and delivers in 5 to 7 business days.
30-Day Trial: Try it at home for 30 days risk-free. Need help? Email us anytime at support@buycosari.com.
2-Year Warranty: If anything goes wrong within 2 years, we replace it free of charge or refund your order in full.
Down and synthetic bags lose loft every time they are washed. The TrailLoft traps 100% of sweat, trail dust, and skin oils—just wash the liner in 40 minutes and keep your bag pristine for a decade.
Breathable brushed microfleece wicks moisture away from skin while the full-length side zipper lets you fine-tune airflow from your shoulders down to your toes.
Double-needle reinforced seams and high-density sheared matte fleece resist lint pilling, seam splitting, and static sparks through dozens of machine wash cycles.
Cosari TrailLoft ZipLinerStandard Competitors
| Feature | Cosari TrailLoft ZipLiner | Standard Competitors |
|---|---|---|
| 2:00 AM Tent Exit & Side-Sleeping | Full-length 110" black side zipper—step out cleanly with zero twisting | Sewn-shut tube traps legs in a twisted knot in the dark |
| Cold-Weather Thermal Boost | Verified +12°F to +15°F quiet brushed matte microfleece loft | Paper-thin polyester or exaggerated '+25°F' knit claims |
| Standalone Blanket Versatility | Unzips 100% flat into an 86" × 63" double-wide camp blanket | Fixed mummy cocoon cannot open flat |
| Collar & Chin Protection | 8-inch fold-over matte fleece cuff shields bag collar & chin | Thin drawstring cord exposes neck to scratchy bag zippers |
| Repacking Into Stuff Sack | 35-second roll into cylindrical ripstop nylon cord-lock sack | Undersized pouch rips at the seam on trip one |
Swipe left for steps 2 and 3
Press the plastic cord-lock toggle on the cylindrical black nylon drawstring sack and slide out the charcoal-gray matte fleece liner in 5 seconds.
Drop the rectangular liner inside your sleeping bag (or lay it flat on a cot), fold the 8-inch charcoal cuff over the bag's collar, and unzip the black side zipper.
Enjoy +15°F of tangle-free matte fleece warmth all night—then pull out just the liner at home and toss it in your cold wash.
I use this inside my sleeping bag on camping trips, then unzip it and use it as a soft fleece travel blanket in hotels. It washes easily and goes right back into the included black nylon drawstring stuff sack.
I've used this several times on cool nights and it adds a surprising amount of cozy warmth for the price. It's lightweight, rolls neatly into the cylindrical nylon sack, and the cord-lock keeps everything packed down. I'd buy it again.
Seriously such a smart camping item. The soft matte fleece is comfortable by itself on top of my sleeping bag during mild summer nights, and it keeps body oils off the bag so I'm not washing that bulky thing after every trip.
I've owned two of these for years and still prefer them over pricier liners I've tried. The roomy rectangular cut doesn't pin my legs together, and the full-length black side zipper makes getting out at night so much easier. Very comfortable fleece, too.
We wanted a few more degrees of warmth without stuffing another bulky layer into our packs. This did the job on breezy cabin and summer mountain nights. It also works as a light cover by itself and has held up well in the washing machine.
I tend to overheat in heavier sleeping bags, so this breathable matte fleece has been a nice comfort layer. When I start feeling too warm, I open the full-length side zipper for more airflow instead of wrestling the entire liner off.
For the price, this performs better than I expected. The synthetic matte fleece feels warm and cozy inside my sleeping bag but doesn't leave me feeling clammy when the temperature changes overnight. A really solid balance of comfort, breathability, and value.
The brushed charcoal fleece feels much nicer against my skin than the basic liners I've used before. It also compresses neatly into the hand-sized cylindrical black nylon stuff sack, so it doesn't end up loose or taking over my duffel.
My old zipperless cotton liner twisted around my legs whenever I got up during the night. I replaced it with this one specifically for the full-length black side zipper. The rectangular shape gives me room to move, and midnight exits are finally simple.
I kept debating whether to pack a flannel sheet because I wanted something genuinely soft, but those get heavy fast. This lightweight matte fleece liner hits the sweet spot. It feels plush enough for sleeping without weighing down the rest of my pack.
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Yes. Unlike narrow 28-inch mummy tubes that pin your knees together, the Cosari TrailLoft features a generous 86" × 31.5" (220 × 80 cm) rectangular footprint. Sleepers up to 6'4" can stretch out, sleep on their side, and bend their knees without straining a single seam.
Absolutely. Because the brushed matte microfleece is supple and drapes naturally without stiff baffling, it tucks effortlessly inside tapered mummy bags while still giving you full rectangular room when used inside standard bags or on its own.
Yes. The 110-inch smooth-glide black zipper runs along the full side and bottom footbox, allowing the liner to open completely flat into a double-wide 86" × 63" soft fleece blanket for campfires, cabin sofas, flights, or warm summer nights.
Simply toss it in your home washing machine on a cold gentle cycle with mild detergent and tumble dry on low heat (or line dry). It dries in about 35–40 minutes with zero pilling or shrinkage—saving your expensive down sleeping bag from destructive washing.
No. Cheap polyester sheets trap sweat because they use tight, unbreathable weaves and sew you inside a closed tube. Cosari's matte microfleece breathes naturally to regulate humidity, and the full-length side zipper lets you vent your feet or torso in seconds.
Yes. We sized the cylindrical black ripstop nylon drawstring stuff sack (8.5" × 4.5") with realistic field tolerances and a one-hand plastic cord-lock toggle. Just fold the liner in thirds lengthwise, roll from the bottom up, slide it in, and cinch in under 40 seconds.