Instantly warm to the touch, Thermolite Boost can add up to 8°C using advanced technology to capture and hold warmth on those challenging chilly nights.

The equivalent of bringing your favourite snuggly blanket along for the adventure, but infinitely more packable, washable, and convenient, Thermolite is a breakthrough fabric that has changed the way we insulate adventure. Upgrading your sleep system is simple when you start with Thermolite.

Extend the life of your sleeping bag, keeping it fresher for longer. Durable and reliable, use on its own through warm summer evenings or inside your sleeping bag for a serious boost to the body temperature.

Gently contoured for a comfortable fit, Thermolite Boost liners are compact and easy to wash and store.