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The jacket is good for temps down to the 40s F but is Not warm enough below that esp. when it gets into the 30s F or below. It's a 'sweater' NOT a jacket but can be used as an outer jacket when it's warmer but is meant to be used as a sweater for insulation under a shell or insulated jacket in cold, winter weather.
Consequently, which is warmer Patagonia Nano Puff or down sweater?
Warmth, Waterproof & Windproof With 800-fill power, the Down Sweater beats the Nano Puff's Primaloft in terms of warmth. You'll do better with a Down Sweater for high alpine activities, but the Nano Puff performs well for backpacking, camping, and day hikes.
Subsequently, question is, how much do you put down on a Patagonia down sweater?
Patagonia stuffs high-end 800-fill-power goose down into the Down Sweater, giving it great loft and compressibility relative to its weight. Fill weight is the actual amount of down used inside the jacket, and the Down Sweater has 3.4 ounces, which, for a non-hooded jacket, is solidly in the middle of the pack.
Patagonia's Grade VII Down Parka is a belay jacket designed for the most hardcore alpine conditions. I took the parka on an ice climbing trip last February for this review. Patagonia claims the Grade VII Down Parka is the warmest and most technical jacket it's ever produced.