Fitness
Insulating Mid Layer Training
Insulating mid layer training pieces trap heat between base and shell—added or removed on climbs and descents to balance sweat and wind exposure.
Insulating mid layer training gear—light fleece, thin synthetic puffy, or active insulation—traps warmth between base and shell without soaking through on tempo climbs. Strip it early if you sweat heavily; re-add before long descents or aid-station pauses.
Bulky down belongs in the pack until you stop moving.
Common questions
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How warm should a mid-layer be for running?
Thin and breathable beats expedition fleece—you should feel slightly cool at the start. If you never unzip the shell on climbs, the mid-layer is likely too heavy.
Related terms
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