Good luck finding a fleece or down vest that weighs less than 53g and packs smaller than a deck of playing cards.
Montane Jetstream Jacket
Weighs 75 grams and packs about the same size as an apple. Fits inside my small Snowpeak 300ml Titanium cup.
The breathable nylon shell material of the Jetstream jacket when worn can be stuffed and insulated with dry grass, heather, Cattail heads, shredded newspaper etc or anything else that can be used as an insulator to reduce convective heat loss in very cold environments. The Jetstream jacket is also remarkably warm in for its weight its own right, as it can cut down dramatically any convective heat loss being windproof and somewhat weather/water resistant but still remaining a MVP material. This allows the air space directly above the skin and between the undergarments to remain dry and thereby stops the undergarments from wetting out and stopping excessive evaporative cooling of the skin.
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