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...

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 Fa

A versatile sleeping bag liner that uses warm and lightweight PRIMALOFT® ACTIVE to ensure you are toasty in your sleeping bag. OMM says:  The warmest synthetic insulation for the lightest weight...

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...