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...

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...

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...

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...

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...

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...

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...

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...