The Sea To Summit Reactor inner sleeping bag with Thermolite Pro technology is designed with the most demanding users in mind. It adds up to 8 degrees Celsius of extra warmth to the sleeping bag, which is ideal for cooler nights.

Its mummy shape optimizes heat retention.


HeiQ technology effectively prevents the development of unpleasant odors, which ensures the freshness of the bag even after several days of intensive wear.

Additional comfort is provided by a drawstring in the bag's hood that allows for customization and better heat retention, while the knit material not only adds stretch but also provides unparalleled comfort throughout the night. This inner sleeping bag is extremely lightweight and collapsible , meaning you can easily store it in the included bag without affecting the space or weight of your gear.

The Sea To Summit Reactor is therefore the ideal choice for those looking for extra warmth without compromising on weight or space in their backpack, while at the same time appreciating innovations that ensure hygiene and comfort while exploring nature.