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ICEFLAME Sleep Systems
Ultralight Sleep Systems for Backpacking
Technical down quilts and mummy sleeping bags developed for lightweight backpacking, mountaineering and cold-weather camps.
Down Quality DocumentationIDFL-tested down quality where specified.
Responsible SourcingRDS-certified down in specified models.95% Muscovy Duck Down850 and 900 fill-power options in key NXT systems.
Worldwide SupportTracked shipping and 30-day returns.
Start With Your Use Case
Choose your ICEFLAME sleep system
Start with how you sleep, where you camp and how much draft control you want. The lightest option is not automatically the right one.
Sleeping Quilts
Low pack weight and flexible ventilation for experienced three-season backpackers.
Explore quilts
Lightweight Mummy Bags
Full coverage for users who want fewer drafts without carrying unnecessary bulk.
Explore mummy bags
Winter Mummy Bags
Higher-fill systems with enclosed construction for sub-freezing trips and cold camps.
Explore winter systems
Modular Systems
Adaptable insulation for changing seasons, sleep styles and layered camp systems.
Explore ThermoFlexSignature Systems
Four different answers to trail sleep
Each system solves a different balance of weight, coverage, draft control and cold-weather capability.
Extra Quilt NXT
A technical open-back quilt with pad attachment and a shaped footbox.
View productCORELITE
A 7D, full 3D box-wall mummy bag built for quilt-like weight with enclosed draft control.
View productFLAME SD1000 NXT
High-fill, full box-wall construction for demanding winter camps.
View productThermoFlex
Separate upper and lower modules that adapt across seasons and camp styles.
View product
Why ICEFLAME
Down quality is only part of the system
Warmth-to-weight performance depends on the interaction between down, baffle geometry, shell fabric, fit and the rest of your sleep system.
High-loft Muscovy downSelected systems use 95% white Muscovy duck down, primarily in 850 and 900 fill power.
Purified-water washingThe down is washed with purified water without chemical cleaning agents.
Purpose-built bafflesBox-wall and zoned constructions are selected around coverage, loft and weight targets.
Field-led developmentTemperature guidance is informed by team field use and customer feedback, with pad, clothing and conditions considered.
Real Trail Decisions
What experienced backpackers check before buying
Independent quilt reviews repeatedly focus on setup and system compatibility, not one headline temperature number.
Draft control
Quilt or enclosed bag?
Quilts reward careful pad-strap setup and footbox control. Cold sleepers or restless sleepers may prefer a lightweight mummy bag.
Ground insulation
Your sleeping pad matters
A quilt cannot replace insulation below you. Match pad R-value to season, ground temperature and personal cold tolerance.
Whole system
Plan for the conditions
Wind, humidity, shelter, clothing, metabolism and food intake all affect comfort. Use temperature guidance as a planning reference.
Independent Field Reviews
See how outdoor creators use ICEFLAME gear
Independent ICEFLAME reviews from outdoor creators.
Mark Outdoors – Long-term use
ICEFLAME NXT custom quilt review after more than a year
Watch on YouTube Camp Life Bushcraft – Field testICEFLAME down quilt tested outdoors on Dartmoor
Watch on YouTube Craig Elliott Outdoors – First lookSemi Standard Mono NXT construction and initial impressions
Watch on YouTube
A Specialist Chinese Outdoor Brand
Built by hikers. Refined in the field.
ICEFLAME has focused on down sleep systems since 2013. The range grew from equipment developed for the team’s own trips into quilts, mummy bags and modular insulation used by backpackers beyond China. The work remains practical: reduce unnecessary weight, control drafts and make each gram of down work efficiently.
Before and After Your Order
Clear support, without the fine-print hunt
Shelters by 3F UL GEAR
Complete the lightweight camp
Explore trekking-pole and freestanding shelters separately from the ICEFLAME sleep-system range.