Reactor Fleece Mummy + Drawcord Sleeping Bag Liner

The Thermolite grid-fleece construction is designed to provide a significant thermal boost, effectively extending the comfort range of your existing sleeping bag. While exact temperature ratings depend on your specific bag and personal metabolism, it is best suited for shoulder-season camping or high-altitude trips where you need that extra layer of insulation.

Yes, you can use it as a standalone sleeping bag in warmer weather or as a travel sheet in hostels and huts. However, keep in mind that it is designed primarily as an insulating layer, so it lacks the weather protection of a full sleeping bag.

The drawcord footbox allows you to open the bottom of the liner for ventilation if you start to overheat during the night. It is a practical feature for temperature regulation, letting you quickly dump heat without having to climb out of your sleeping system.

Yes, the liner features a tapered mummy silhouette specifically designed to nest inside most mummy-shaped sleeping bags without creating excess bulk. It comes in two sizes, Compact and Standard, so check your sleeping bag's dimensions to ensure the best fit.

The HeiQ Fresh treatment is integrated into the fabric to inhibit the growth of odor-causing bacteria. It helps keep the liner feeling fresh over extended trips, meaning you won't need to wash it as frequently as untreated gear.

The liner packs down into an included stuff sack measuring approximately 9.8 x 3.5 x 5.5 inches. It is designed to be a compact, lightweight addition to your kit, balancing the need for extra warmth with the realities of long-distance trekking.