Thermolite Sleeping Bag Liner Mummy

The Lifeventure Thermolite Sleeping Bag Liner is engineered to enhance your sleeping bag's thermal performance using Thermolite hollow-fibre insulation — the same technology trusted by outdoor professionals worldwide. This clever liner traps warm air within its fibres to deliver meaningful additional warmth, allowing you to extend the comfort range of your existing sleeping bag without the need to invest in a heavier-rated model.

Lightweight and Packable
Designed with weight-conscious adventurers in mind, this liner packs down small and adds minimal weight to your kit. Whether you're thru-hiking, cycle touring, or heading out on a weekend wild camp, the Thermolite liner slips easily into your pack without taking up precious space. It comes with its own stuff sack for convenient storage and transport.

Versatile Performance
Available in a mummy shape that closely follows the contours of your body for maximum thermal efficiency, this liner works brilliantly inside a sleeping bag during colder conditions. When temperatures rise, it can be used as a standalone sleep sheet — perfect for hostel stays, summer camping, or travel in warmer climates. This versatility makes it a year-round piece of kit that earns its place on every trip.

Hygiene and Sleeping Bag Protection
Using a liner inside your sleeping bag significantly reduces the build-up of body oils, sweat, and dirt that can degrade insulation performance over time. The Thermolite liner is fully machine washable, making it far easier to keep your sleep system fresh compared to washing a full sleeping bag. This simple addition can meaningfully extend the effective lifespan of your sleeping bag.

Comfort-First Fabric
The Thermolite fabric offers a soft, comfortable feel against the skin while providing excellent moisture-wicking properties. It draws perspiration away from your body to help regulate temperature and prevent that clammy feeling during the night — a common issue with lower-quality liners. The result is a drier, more comfortable sleep, whatever the conditions.

Key Features

• Thermolite hollow-fibre insulation adds extra warmth to your sleeping bag
• Available in mummy shape for an efficient, close-fitting design
• Lightweight and highly packable with included stuff sack
• Doubles as a standalone sleep sheet in warm conditions
• Moisture-wicking fabric for a comfortable, dry sleep
• Machine washable for easy care and hygiene
• Protects your sleeping bag from wear, dirt, and body oils
• Ideal for camping, backpacking, trekking, and travel