Insulative

The Vapor Barrier is a sleeping bag liner designed to protect your sleeping bag from moisture while also trapping your body heat and keeping you warm and comfortable in the harshest cold weather conditions. Cocoon says The COCOON Vapor Barrier Liner…

A versatile sleeping bag liner that uses warm and lightweight PRIMALOFT® ACTIVE to ensure you are toasty in your sleeping bag. OMM says:  PRIMALOFT® ACTIVE Insulating Fabric Technology Sleeping bag liner. The warmest synthetic insulati…

Versatile, lightweight sleeping bag liner with premium Polartec® Alpha™ Direct fleece. Big Agnes says:  Wherever your travels and overnights take you, wrap yourself in the soft, cozy warmth of our Alpha Direct Fleece Liner. Add this li…

The Western Mountaineering Hot Sac is a Vapour Barrier Liner intended as a cold weather sleeping bag accessory.  It can can also be used as a reusable emergency bivy. Western Mountaineering says This vapor barrier liner is your most import…

A lightweight liner that adds warmth and comfort to your sleep system Sea to Summit says:  The go-to liner for every adventure. Regardless of sleeping position or tossing and turning, the stretch knit construction and armholes provide complete..…

Adds warmth and comfort while keeping your sleep system clean Sea to Summit says:  The go-to liner for every adventure. Regardless of sleeping position or tossing and turning, the stretch knit construction and armholes provide complete freedom o…

Adds warmth and comfort without excessive bulk Lifeventure says:  Designed to add warmth without bulk, the Thermolite Sleeping Bag Liner is made from a lightweight, durable fabric that is soft and stretchy for a comfortable night’s sleep.…

A warm, roomy liner for extending your sleep system Lifeventure says:  Designed to add warmth without bulk, the Thermolite Sleeping Bag Liner is made from a lightweight, durable fabric that is soft and stretchy for a comfortable night’s s…

UOG TOP PICK - Cocoon Mountain Wanderer Sleeping Bag - Quite a light bag for its rating, great as a summer bag or for hut hopping / travel. Doesn’t pack down as well as some others at similar weights but the price is amazing. Cocoon's Mountain.…