I’ve owned the Pnuma and Arris. Gave the Arris away, the Pnuma is far superior due to the snugger fit and better heat transfer. I’ve experimented with base layers below the vests (poly and wool) and above. If using traditional base layers, keep the vest below the base layer. However, the absolute best combo I found was oddly enough a brynje or aclima wool or poly net shirt under the pnuma vest. It subjectively feels exponentially warmer. The heater itself is buffered from your skin and is more comfortable, but those little net pockets capture the heat and “feel” as if it warms a larger area of the skin.
Without the heated vest, I never use the net layers if I plan to be exclusively static. With the heated vest alone, I’d say it takes the edge off and allows you to grind out longer. I can’t confidently say it allows me to always shed a layer. With the vest and the net shirt, I consistently require less clothing, or less heavy clothing and can reduce bulk. It’s a hard one to explain until you try it, but if you get a pnuma vest, I highly recommended trying the combination out.
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