Sea to Summit Reactor Sleeping Bag Liner – Mummy with Drawcord (Standard) – Sulphur Yellow

Boost your sleeping bag's warmth and versatility with the Sea to Summit Reactor Liner – Mummy with Drawcord. Engineered for cold-weather performance, this liner features advanced Thermolite Pro fabric with infrared-absorbing ceramic pigments and EcoMade hollow-core fibers to retain and reflect body heat efficiently.

The stretch-knit construction offers a cozy, unrestricted fit that adapts to all sleeping bags, while the drawcord footbox adds ventilation and the option to walk around camp without removing the liner. Whether you’re extending your sleep system's range in the backcountry or looking for lightweight warmth on its own, the Reactor Liner is your ultimate thermal upgrade.

Features:

• Increased Warmth: Adds critical insulation to your sleep system in cool to cold conditions.

• Thermolite Pro Technology: Infrared-reflective ceramic pigments and hollow-core fibers boost thermal retention.

• Comfort Fit: Stretch-knit fabric adapts to your movement and sleeping bag shape.

• Footbox with Drawcord: Offers adjustable ventilation and the freedom to walk around camp while wearing the liner.

• Packable & Lightweight: Ideal for backpacking, travel, or layering inside any sleeping bag.

• Mummy Shape: Efficient thermal design with optional arm openings (classic version) for additional mobility.