Sea to Summit Reactor Extreme Thermolite Sleeping Bag Liner


The THERMOLITE® Reactor Extreme uses Sea To Summit's super insulating 110g/m3 to seriously increase sleeping bag performance. 

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  • Description

    The spacious design is slightly tapered from head to foot to reduce weight and increase thermal efficiency, and the drawcord hood can be cinched down for extra warmth when required.

    This knit fabric also has serious stretch to it, making the Reactor Extreme the ideal liner for the restless sleeper.

    Reactor Extreme THERMOLITE® provides lightweight warmth to help insulate and keep the user warmer longer. It is a 110g/m² knitted fabric that is extremely breathable and extremely stretchy, which is great for the restless sleeper. THERMOLITE® technology delivers lightweight warmth by trapping an insulating layer of warm air between the fabric and your skin.

    The THERMOLITE® fibre is a hollow core polyester that provides amazing warmth for it’s weight. It is machine washable and quick drying.

  • Specifications

    Adds extra warmth

    Mummy shape with a box foot

    Drawcord hood with mini cord lock

    Extends life of sleeping bags by keeping them clean

    Contrasting colour along the top edge makes it easier to find the opening

    Packs into its own Ultra-Sil® stuff sack

    Also available in a long version for the vertically blessed

    110g/m² Thermolite® construction throughout

    210 CM

    90 CM

    399 G

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