Alpha Direct, PrimaLoft ACTIVE and Octa: A Guide to Active Insulation
Posted by Andy Neil on 3rd Nov 2026
Keeping warm while moving can be tricky. Too much insulation and you’ll sweat on the climb; too little and a cold wind can quickly chill you at the ridge. Polartec Alpha Direct, PrimaLoft ACTIVE, and Octa take a particularly effective approach: lightweight, open constructions that trap warm air while letting heat and moisture escape. Paired with the right outer layer, they offer exceptional
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