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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SamBob Alpha 120 Hoodie Review - ''My go-to active insulation when the temperature drops.''
Posted by Andy Neil on 20th Nov 2025
When I heard that SamBob were releasing a 120gsm Alpha Direct version of their classic oversized thru-hiking hoodie, I was instantly interested. I’ve used a lot of Alpha 90 over the years and always loved how breathable and versatile it is, so the idea of a warmer, loftier 120gsm version immediately grabbed my attention.
When the box arrived at the warehouse, I grabbed one immediately and h
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Polartec Alpha Direct explained
Posted by Mark Richardson on 19th May 2022
Alpha Direct is one of a range of insulation from Polartec, we explain what it does and include our opinion of it.