Reactor Lightweight Sleeping Bag Liner Colour:Grey Filled with ethically-sourced 800–850 loft

Filled with ethically-sourced 800–850 loft non-PFC hydrophobic down that repels moisture

Includes classics such as the treks to Everest and K2 base camps and the Annapurna Circuit

Materials: Waterloc canvas

Available in four modern colours and UV-resistant

Reactor Lightweight Sleeping Bag Liner Colour:Grey Filled with ethically-sourced 800–850 loftThe ultralight upgrade to any sleep system, the Sea to Summit Reactor Lightweight Sleeping Bag Liner uses Thermolite Pro fabric with infrared absorbing ceramic pigments and hollow core fibres to add up to 4C of warmth with minimal pack impact. Stretch knit construction and articulated arm openings ensure unrestricted movement throughout the night, and a fitted hood delivers targeted warmth without bulk. HeiQ Fresh odour control, quick drying