Thermic Expedition Sleeping Bag Liner

The Rab Thermic Expedition Sleeping Bag Liner is a mummy-shaped microfleece liner designed to add warmth, comfort, and protection to a primary sleeping bag for expeditions and cold-weather camping; it’s an accessory to boost insulation rather than a standalone sleeping bag.

It’s made from Thermic Microfleece (100% synthetic), a heavyweight fleece that adds significant warmth, feels soft against skin, is durable, and helps wick moisture away from your sleeping system.

The liner is a mummy cut in one size that fits most adults, with the most consistent dimensions listed at about 92 cm x 225 cm (36 in x 89 in); the body-conforming shape helps trap heat, so verify the length against your height.