There are a huge number of variables that impact the add-on thermal performance that you can expect from a liner. Besides environmental conditions, here are two significant factors:
- Some sleeping bags retain warmth better than others (this is usually due to construction details like hoods, draft collars/draft tubes, and footboxes). The temperature rating of the bag may not be representative of the temperature a live, moving sleeper will sleep comfortably at.
– Some sleeping pads insulate better than others (this is often due to whether internal air movement dissipates warmth)
There is no internationally recognized laboratory test for measuring liner thermal performance. We don't want to set the expectation that a liner will absolutely add a certain amount of warmth, hence the ‘adds up to’ designation applied to the Reactor series.
For more information regarding adding warmth with a liner, visit our Blog Post.
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